Heliconias are widespread in the Neotropics and are extremely prevalent in tropical rainforests. They are frequently found in gardens and landscaped areas as decorative plants.
How does a heliconia plant appear?The leaves are glossy, green, paddle-shaped, and oval-shaped. They have an upright growth pattern, with the flower stems in the middle. In terminal racemes, which can be kept either erect or pendulant, flower bracts are placed. Heliconia lobster claws can be found in red, orange, or yellow, and are frequently finished with a splash of brilliant gold.
Heliconia can they grow in water?In planters, heliconias are essentially in containers. They favor rich, moist soils that drain well. Any planter or container should have plenty of drainage, but for heliconia — which needs water frequently — it is especially important.
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explain why mitosis is normal in cells containing both horse and donkey chromosomes, but the mixed set of chromosomes interferes with meiosis.
Answer: Horses and donkeys have different numbers of chromosomes. Therefore, the offspring (mule) is unable to make sperm or eggs. This is because a horse and a donkey have different numbers of chromosomes. Horses have 64 and donkeys have 62. The baby gets half from the horse (32) and half from the donkey (31). When they combine they have a total of 63. During meiosis, when the chromosomes split, there is 31 pairs with 1 left over that cannot pair with another chromosome. This prevents all of the chromosomes from pairing so the sperm or eggs cannot be made.
Explanation:
Schleiden believed that free cell formation is where cells come from which was proven incorrect. Where do cells actually come from?.
Schleiden thought that cells were created spontaneously or through a process known as free cell creation. According to this theory, cells could develop from inanimate objects. However, Schwann thought that cells originated from pre-existing cells.
Who made the hypothesis of spontaneous generation?One of the first authors to express the hypothesis of spontaneous generation—the idea that life can emerge from inert matter—was the Greek philosopher Aristotle (384–322 BC). According to Aristotle, if nonliving material contained pneuma (also known as "vital heat"), life may have developed from it.
What in biology is a pneuma?Pneuma, as used in classical Greek medicine, is the type of circulating air required for the systemic operation of essential organs. It is the substance that keeps awareness alive in a body
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Schleiden thought that cells were created spontaneously or through a process known as free cell creation. According to this theory, cells could develop from inanimate objects. .
Who made the hypothesis of spontaneous generation?One of the first authors to express the hypothesis of spontaneous generation—the idea that life can emerge from inert matter—was the Greek philosopher Aristotle (384–322 BC). According to Aristotle, if nonliving material contained pneuma (also known as "vital heat"), life may have developed from it.
What in biology is a pneuma?Pneuma, as used in classical Greek medicine, is the type of circulating air required for the systemic operation of essential organs. It is the substance that keeps awareness alive in a body
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on rare occasions, a new tetraploid species of plant may form. what factors allow the species to form and propagate?
When on rare occasions the new tetraploid species of plants are formed then the factors that allows the propagation are chromosome nondisjunction, self replication.
So, if a plant produces diploid gametes via nondisjunction and that they self-fertilize, the end result could be a new, tetraploid species. This species is now reproductively remoted from its discern as though the 2 have been to mate they could create nonviable triploid individuals joining of diploid gametes, self-fertilization, chromosome nondisjunction the character has inherited an extraordinary wide variety of chromosome sets (3n, 5n, etc), they're commonly infertile.
This is due to the fact the chromosomes can not pair up successfully at some point of meiosis and hence no purposeful gametes are produced. If the character has a fair wide variety of chromosome sets, they're commonly fertile.
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Which claim is most likely based on science?
A.Teas made from carrot leaves and stems are remedies that cleanse toxins from the body.
B.The orange color of carrots is due to a chemical called beta carotene.
C.Orange-colored carrots taste better than white or purple carrots.
D.Orange-colored carrots were introduced by the Dutch people, who preferred them to white carrots.
HELPPPP
Answer:
B
Explanation:
2. do the experimental results support that hiv is the selective agent driving evolution of ccr5-δ32? why or why not
Because the Delta32 mutation impairs the functional expression of the CCR5 chemokine receptor, which HIV-1 typically uses to enter CD4+ T cells, homozygous carriers of the mutation are resistant to HIV-1 infection.
Chemotaxis, which is cellular motility facilitated by chemokine receptors, is located on cell surfaces. The human immunodeficiency virus (HIV) uses the CC chemokine receptor 5 (CCR5) to infect cells. Therefore, methods for stopping and treating HIV infection that specifically target human CCR5 are being developed. The natural course of HIV infection makes CCR5 a prime target for the creation of medications and immunogens that can trigger systemic, and particularly mucosal, responses to shield those who are exposed from infection. The genesis of CCR5-Delta 32 and the rationale for why just such a narrow range of
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Based on the phenotypes of the p generation and f1 generation, what are possible phenotypes in the f2 generation?.
When a monohybrid cross is in its F2 generation, Tall and Dwarf phenotypes are both present. The phenotypic ratio is 3:1.
The F1 and F2 generations are what?F2 generation is the second filial generation of the offspring produced through inbreeding of F1 people. F1 generation denotes the first filial generation of the offspring from the parents.
The P F1 F2 and F3 generations are what?The P parent generation's offspring are referred to as the F1 (for filial, or "offspring") generation. The children of F1 are known as the F2, and the children of F2 are known as the F3, the F4, the F5, and so on. This continues up until the last generation of the pedigree study.
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please help
What are mutations, and how do they lead to evolution?
What is genetic drift, and how does it lead to evolution?
What is natural selection, how does it lead to evolution?
What is gene flow, and how does it lead to evolution?
What is nonrandom mating, and how does it lead to evolution?
What are mutation, and how do they lead to evolution?
A mutation is an alteration to DNA, the building block of life.
A population will evolve if a mutation produces a characteristic that makes it more likely that the individual carrying the mutation will live, mate, and give birth to offspring who also carry the mutation. The allele frequency for that attribute will alter when more and more individuals of the population carrying the mutation reproduce and pass the mutation on to more and more population members, signaling that the population has evolved.
What is genetic drift, and how does it lead to evolution?
Genetic drift is the shift in population frequency of a gene variant brought on by random chance. Rare alleles may be lost due to genetic drift, which can also reduce the size of the gene pool. The idea that genetic drift contributes to the evolution of new species is based on the fact that it can also make a new population genetically distinct from its ancestral population.
What is natural selection, how does it lead to evolution?
Natural selection is the Evolution Mechanism. Charles Darwin put forth the idea. There are finite amounts of natural resources like water, land, air, and wood. According to nature, the person who adapts rapidly is the most likely to live, while the person who does not adapt is not likely to. This causes the creatures to alter, and nature adapts as a result. We can easily notice the difference between offspring and their ancestors.
What is nonrandom mating, and how does it lead to evolution?
Non-random mating won't make allele frequencies in the population change by itself, though it can alter genotype frequencies. This keeps the population from being in Hardy-Weinberg equilibrium, but it's debatable whether it counts as evolution, since the allele frequencies are staying the same.
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most trees and shrubs continue to grow year after year. such plants are known as a) perennials. b) annuals. c) biennials.
Plants such as trees and shrubs that continue to grow year after year are known as A. perennials.
Plant growth is a process of cell division and elongation that causes an increase in plant size. root elongation, increase in branch height, increase in tree branch size, increase in leaves, increase and enlargement of branches. Plant growth occurs in meristematic areas. This tissue is located at the tip of the stem, root tip, and cambium. Plants such as trees and shrubs that continue to grow year after year are known as perennials.
Perennial plants are annual plants. Perennial plants will continue to grow and continue to flower each year. These plants can survive for many years even though they have reproduced or completed their life cycle.
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Mechanoreceptors located in the skin and mucous membranes are called ______ receptors.
Mechanoreceptors always located in the part of skin and in mucous membranes which we called it as somatosensory receptors.
Mechanoreceptors within the skin are classified as encapsulated, that is, enclosed by a capsule, or unencapsulated, which is a cluster of free nerve endings. As the name indicates, a loose nerve terminal is an unencapsulated dendrite of a sensory neuron membrane. The somatosensory system also includes receptors and neurons that transmit information about frame role and motion to the brain.
These proprioceptors are located in muscles and tendons and respond to stretch and contraction, anxiety and release. Each sensory receptor, whether mechanoreceptor, photoreceptor, chemoreceptor, thermoreceptor, or nocireceptor, is responsible for processing environmental stimuli and converting them to electrical energy.
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a research group has characterized the fundamental niche of a small mammal species. the researchers look at a map and identify all of the places in the state where this species should be present. when they visit each location that meets all requirements of the fundamental niche, they find that in 20% of the locations, the small mammal is not there. how could this observation be explained?
Answer: All of these choices are correct (below)
A population could be there, but no individuals were caught.
The small mammal may have never had a population in that area.
There could be other organisms present that push the small mammal into its realized niche.
The researchers did not accurately define the fundamental niche.
No people were apprehended, however there may be a population there.There was never a colony of the little animal there. Other species might be there and force this same small mammal into realized niche.
The total collection of circumstances that allow an animal (species, species) to live and reproduce itself is referred to as its fundamental niche. Realized niche refers to the circumstances that a particular animal (population, species) really uses, after taking into consideration interactions with the other species (predation, particularly competition). Many organisms go through a wide variety of sizes as they grow from autonomous juveniles through mature adult, and as a result, the majority of them change how they use resources (their niches) throughout the course of their lives. - Abstract. As they grow from autonomous juveniles to competent adults, many creatures experience a wide variety of sizes, and as a result, the majority of them change how they use resources (or their niches) throughout the course of their lives.
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cell is put into a liquid and remains its original size. What is the best conclusion that can be drawn from this observation? The concentration of water is higher in the cell than in the liquid, so water is leaving the cell. The concentration of water is higher in the cell than in the liquid, so water is moving in and out of the cell at the same rate. The concentration of water in the cell is the same as in the liquid, so water is moving in and out of the cell at the same rate. The concentration of water in the cell is the same as in the liquid, so water is leaving the cell.
Answer:
The concentration of water in the cell is the same as in the liquid, so water is moving in and out of the cell at the same rate.
Puberty is initiated when the ______ starts secreting gonadotropin-releasing hormone.
Puberty is initiated when the hypothalamus starts secreting gonadotropin-releasing hormone.
What is puberty and how is it initiated?Puberty is that time of life when a child experiences physical and hormonal changes that mark a transition into adulthood and child develops secondary sexual characteristics and becomes able to have children.
Most females start puberty when they are 8 to 13 years old and males start between 9 and 14years of age.
Puberty is initiated with an increase in pulsatile release of GnRH from the hypothalamus after a quiescent period during childhood
When the body reaches a certain age, brain releases a special hormone that starts the changes of puberty which is called gonadotropin-releasing hormone (GnRH).
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the best practice for controlling agricultural pests is: group of answer choices eradication sterile insect control integrated pest management biological control
Sterile insect control is the finest method for eradicating pests in agricultural areas. integrated pest control Eradication. biological restraint.
What is the most effective way to control illness and pests?Pests can be kept out of your garden with the help of common and efficient physical measures like barriers and traps. For instance, sticky traps or insecticidal soap can be used to control common pests like aphids and beetles. Physical restrictions can also aid in halting the spread of infections.
What is the name of the pest control method?Biological control refers to the employment of living creatures to reduce the damage that pest populations might otherwise cause.
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Suppose that for a certain gene, nearly 100 percent of the normal level of expression is required to produce the normal phenotype.Based on this requirement, one could predict that a _______ mutation would be _______.
A) gain of function; recessive
B) loss of function; dominant
C) loss of function; recessive
D) nonsense; recessive
E) loss of function; a conditional mutation
Suppose that for a certain gene, nearly 100 percent of the normal level of expression is required to produce the normal phenotype. Based on this requirement, one could predict that a loss of function mutation would be dominant. Correct answer: letter B.
A loss-of-function mutation is predicted to be dominant because, in this case, even a small amount of the mutant gene would be enough to disrupt the normal gene expression, resulting in the phenotype being affected. If the mutation were recessive, this would not be the case, and it would require two copies of the mutant gene in order to cause a phenotype.
The Importance of Dominant Mutations in Gene FunctionA dominant mutation refers to a mutation in which a single allele can cause a phenotypic change. This means that a single copy of the mutated gene may be sufficient to produce a different expression of the gene. This differs from a recessive mutation, in which two copies of the mutated gene are needed to produce the phenotype. This means that a dominant mutation is more likely to affect the gene function of an organism.
The most obvious example of a dominant mutation is Huntington's syndrome. This disease is caused by a mutation in a single allele that causes a change in a specific gene. This mutation leads to the symptoms of Huntington's syndrome, which include problems with:
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DNA molecules undergo changes by radiation from X rays leading to
A. stronger life forms.
B. sleeping sickness.
C. leg wounds.
D. mutations.
Answer:
Explanation:
D
darwin observed that different types of organisms live on either side of a geographical barrier. such barriers prevent .
The outermost membrane of a euglenid chloroplast is thought to have been derived from what part of an original host cell that engulfed a green alga?.
The Plasma membrane of the enveloped alga cell serves as the source of the apicoplast's second outermost membrane.
Where did all chloroplasts come from?Following the endosymbiotic establishment of chloroplasts in eukaryotes by a cyanobacterium, their proliferation was facilitated by the diversification of eukaryotic hosts and the subsequent engulfment of eukaryotic algae by formerly nonphotosynthetic eukaryotes.
How did eukaryotic cells develop mitochondria and chloroplasts?Chloroplasts and mitochondria most likely developed from absorbed bacteria that originally existed as autonomous entities. An aerobic bacterium was eventually swallowed by a eukaryotic cell, which later established an endosymbiotic bond with the host eukaryote and gradually transformed into a mitochondrion.
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what enables the sympathetic and parasympathetic divisions to bring about opposing effects in most organs they impact?
Norepinephrine and acetyl choli enables the sympathetic and parasympathetic divisions respectively to bring about opposing effects in most organs they impact.
What are sympathetic and parasympathetic divisions?Postganglionic neurons in the sympathetic division release norepinephrine and postganglionic neurons in the parasympathetic division release acetyl choli that bring opposing effects in most organs they impact.
Sympathetic system controls fight-or-flight responses and we can say that this system prepares the body for strenuous physical activity whereas the parasympathetic system regulates the rest and digest functions. But both the systems are divisions of the autonomic nervous system.
Ganglia for the sympathetic division are located outside the spinal cord and ganglia for the parasympathetic division are located near or in the organs they connect with.
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in the figure, populations of a plant species labeled i, ii, and iii are depicted using simplified age structures containing three age classes: young seedlings, middle aged juveniles, and older adults. which population appears to have stable growth?
Figure three is displaying to have a stable growth increase. It is due to the fact the quantity of birth(seedlings) is identical to the quantity of death(older adults). This keep the population stable. Option(2)
Incase of the primary discern, we see a pyramidal structure, for that reason displaying the seedlings are a long way greater than the older adults. This manner the the increase isn't solid, as a substitute it shows a growing or developing population. Similarly the second one discern display a inverted triangle structure, depicting the older adults are tons greater than the seedlings. This will result in a decline withinside the populace soon.
The truth that a population increase amount is steady all the time, however, places robust constraints on how excessive it could be. Since no organization can develop all the time at a fee better than the increase fee of the economic system wherein it operates, the steady increase fee can't be extra than the general increase fee of the economic system. the entire quantity of human beings or population in a rustic or region. : the whole of people occupying a place or making up a entire. : the whole of debris at a selected strength level.
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Correct Question:
Which item represents the highest level of biological organization?
O A. Blood cell
OB. Nervous system
OC. Muscle tissue
о O D. Heart
The highest level of biological organization is Nervous system. The nervous system represents a higher level of organization than the other options because it consists of various components working together to coordinate and regulate bodily functions. The correct option is B.
What is the highest level of biological organization?The highest level of biological organization is the organism level, which includes all of the systems and tissues working together to maintain the life of the individual. Therefore, the nervous system, muscle tissue, and heart are all components of the organism level.
The blood cell, while important, is a component of the tissue level, which is a lower level of biological organization. Therefore, the highest level of biological organization represented by the options given is the nervous system.
Therefore, the correct option is B.
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pre-frq preparation: identify and explain what threatened the sugarcane crop in australia in the 1930s. describe what australians did in response to the threatened sugar cane crop. explain how efficient or inefficient cane toads were at eating cane grubs and beetles. describe how cane toads kill fish. describe how cane toads altered the ecosystem of australia.
The species that posed a threat to Australia's sugarcane crop in 1930 were cane grubs. The native species of Victoria are highly threatened by cane toads.
The native species of Victoria were seriously threatened by cane toads. In addition to competing for food, they may quickly spread and colonize new places, may bring new viruses and diseases, and poison via their toxic glands. According to the Victorian Catchment and Land Protection Act of 1994, cane toads fall under the category of controlled pest animals. Threat reduction strategy for the cane toad (Bufo marinus). In order to lessen the effects of cane toads and conserve native species and ecosystems that are impacted by cane toads, the Australian Government has issued a threat abatement plan that outlines the research, management, and other efforts required. Cane Toads kill them by injecting their venom into their bodies. By utilizing poison to kill their predators, the cane toad has altered Australia's environment. This process eliminates certain species, but it also promotes the re-emergence of other prey species.
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Which type of cellular transport moves molecules from low concentrations to high concentrations?.
Active Transport moves molecules from low concentrations to high concentrations.
What is Active Transport?
Transportation is a natural, physiological and essential process that occurs in all higher organisms including plants, animals, and humans. This process is important to sustain life, as it functions by transporting, different essential materials constantly to and from all parts of the body
Active Transport is the process that involves movement of molecules from regions of lower concentration to regions of higher concentration with the use of external energy against a gradient or an obstacle.
A protein pump makes use of stored energy in the form of ATP, to move molecules during active transport.
Active Transport is of two types:
Primary active transportSecondary active transportExamples of Active Transport include:
• Phagocytosis of bacteria by Macrophages.
• Movement of Ca2+ ions out of cardiac muscle cells.
• Transport of amino acids across intestinal lining in the human gut.
Therefore, Active Transport moves molecules from low concentrations to high concentrations.
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the part of the nephron whose epithelial cells are most responsible for resorption and secretion is the
The AQPs aid in the majority of water reabsorption that takes place in the nephron. The proximal tubule and the descending limb of the loop of Henle then reabsorb the majority of the fluid that was filtered at the glomerulus.
The multisegmented tubule, which is made up of the proximal convoluted tubule, the loop of Henle, and the distal convoluted tubule, reabsorbs the "good" (water and nutrients) and secretes the "bad" (metabolic waste products) from the nephron. The glomerulus filters the blood.
Although reabsorption happens in every renal tubule, the proximal convoluted tubules host the majority of it. Either passive or active transport methods are used to selectively reabsorb materials. The proximal convoluted tubule is where the majority of sodium reabsorption takes place.
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A horticulturalist wants to produce geraniums with specific characteristics. She knows that the trait of red flowers is governed by the allele R (RR and Rr) and the trait of white flowers is governed by the allele r (rr).The horticulturalist has a red geranium with an uncertain genetic makeup. She crosses it with a white geranium (rr) and gets a generation in which half of the plants have red flowers and half have white flowers. What does this combination of offspring tell her about the genetic makep of the red geranium parent?
a. The red geranium is heterozygous for red flowers (Rr).
b. The red geranium is homozygous for red flowers (RR).
c. The trait shows incomplete dominance.
d. The red geranium is homozygous for white flowers (rr).
Answer:a
Explanation:the gernairium is the flower of death aka poppyseeds
how did the multidrug resistant strains of mycobacterium tuberculosis, like those in the prison, arise?
Bacteria experience random DNA mutations, which can change the way they behave. Strains that are resistant to antibiotics are developing as a result of the gene.
In the billions, bacteria reproduce. A copy of a gene's DNA that makes a bacterium resistant to drugs may be passed on from one bacterium to another. The newly added DNA makes previously non-drug-resistant bacteria drug-resistant. Only drug-resistant bacteria can survive when there are drugs present.
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biological features that have a common origin, even if they have a different function, are said to be
Biological features that have a common origin are called Homologous structures.
What are Homologous structures?
The word Homologous describes things that have some sort of similarity in some ways.
Homologous structures refer to the body parts with common features or traits. They are structures that evolved from a common ancestor.
A common example of homologous structures is the wings of bats and the arms of primates. These two structures do not look similar or have the same function, but genetically, they come from the same structure of the last common ancestor. Therefore, homologous traits of organisms are explained by descent from a common ancestor.
Therefore, biological features that have a common origin are called Homologous structures.
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Explain how some algal species are able to survive during periods of nutrient starvation and extreme temperatures.
To create organic food, these phototrophic algae use the light energy from sunlight, carbon dioxide, and water. They use the food they produce as a means of survival when they are starving for nutrients, and they eat it.
A tremendously diversified collection of primarily watery photosynthetic organisms called algae are responsible for over 50% of all photosynthesis on Earth. A broad variety of antenna pigments are used by algae to collect light energy for photosynthesis, which gives different forms of algae their distinctive colours. What is currently known about the carbon dioxide fixation route and the light harvesting reactions is largely the result of early study with algae. Higher plants and algae also undergo photosynthesis, yet the two processes are extremely similar. Two of the three varieties of carbon dioxide-concentrating mechanisms that are known to exist in photosynthetic organisms are present in various kinds of algae. Algae may contribute to the global carbon cycle by aiding in the removal of excess carbon dioxide from the atmosphere.
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100 points please help!
Consider a cell in the G1 phase of the cell cycle, in what order do the following events take place after G1?
Place these in order:
Prophase
Metaphase
Telophase
Anaphase
DNA replicates
Cell prepares for mitosis
Cytokinesis
Answer:
remember the acronym P MAT to remember the phases of mitosis!
Explanation:
1.) Cell prepares for mitosis
2.) Prophase
3.) metaphase
4.) anaphase
5.) DNA replicates
6.) telophase
7.) Cytokinesis
The cell differentiation in G1 phase start with the cell prepares for mitosis.
What is mitosis?Mitosis is defined as when replicated chromosomes are split into two new nuclei during the cell cycle. A cell duplicates all of its parts, including its chromosomes, and then divides into two identical daughter cells. Due to the importance of this procedure, specific genes carefully regulate each phase of mitosis.
A cell in the G1 phase of the cell cycle, the order of the event take place after G1 phase are Cell prepares for mitosis, Prophase, metaphase, anaphase, DNA replicates, telophase and Cytokinesis. The cell cycle should proceed in the following order: G1, S, G2, M, and maybe an escape into G0. The first gap, or G1, is when the cell grows and performs its function in the body.
Thus, the cell differentiation in G1 phase start with the cell prepares for mitosis.
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describe two events that are common to both mitosis and meiosis that esure the resulting daughter cells inherit the apporopiate number of chromsomes
The G2 checkpoint and DNA synthesis occur during interphase, which are both shared by mitosis and meiosis.
During interphase, DNA replication occurs. Mitosis can maintain the same number of DNA chromosomes as the parent cell due to chromosome replication, whereas division only halves the DNA despite going through two cellular divisions. Before the cell enters mitosis or meiosis, the G2/M checkpoint ensures that all chromosomes have been replicated and that the replicated DNA is not damaged.
Meiosis is the process by which egg and sperm cells are formed. Mitosis is a necessary process for life. A cell duplicates all of its contents, including its chromosomes, and splits to form two identical daughter cells during mitosis.
Mitosis is the process by which body cells divide and replicate themselves in order to grow and repair. Meiosis is the process by which egg and sperm cells are formed, and the new cells have half the genetic material of the parent cell.
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once the hummingbird dna is cloned, we have the problem of finding the piece of dna that holds our gene of interest. explain how nucleic
Answer:
yes
Explanation:
ok