Answer: Alleles are the pairs of genes occupying a specific spot called locus on a chromosome. Typically, there are only two alleles for a gene in a diploid organism. When there is a gene existing in more than two allelic forms, this condition is referred to as multiple allelism. Allelism refers to any of the several forms of a gene. These genetic variations arise usually through mutation and therefore are responsible for hereditary variations.
In Drosophila, eye color is controlled by 15 alleles, wild type or normal allele is 'W' which produces red eye color which is dominant over all other alleles. Allele 'w' codes for white eye color which is recessive to all other alleles.
What would be the difference in a mistake in the DNA of a body cell, such as a brain cell, vs. a mistake in the DNA of a germ cell that would eventually make a sperm cell?
Answer:
A mistake in the DNA of a body cell, such as a brain cell, would only affect that particular cell and its daughter cells produced through mitosis. This is because DNA mutations occurring in body cells are not passed on to offspring during reproduction.
In contrast, a mistake in the DNA of a germ cell, such as a precursor cell that eventually develops into a sperm cell, can be passed on to the offspring during reproduction. This is because germ cells undergo meiosis to form gametes (sperm or egg cells), and any mutations in their DNA can be passed on to the next generation.
Therefore, mistakes in the DNA of germ cells have implications for the genetic makeup of future generations, while mistakes in the DNA of body cells only affect the individual organism in which they occur.
which revision of the excerpt best adds a subjective tone?
The excerpt from a loss of friendship best lends a personal tone. A subjective tone of voice conveys opinions, feelings, or judgements.
What is a Subjective Tone?Two single-frequency tones will interfere with one another and create a beat frequency when they are present in the air at the same moment. If the beat frequency is in the mid-frequency range, it will be perceived by the human ear as a third tone, also known as a "subjective tone" or "difference tone," which is equivalent to the difference seen between frequencies of the two tones.
You can probably expect experiences, sensations, feelings, and ideas in the details. An neutral tone is objective. It is unbiased or objective because it does not express any opinions in favour of or against a subject.
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How do the nuclei of the two cells compare?
Answer:
The number of nuclei formed in mitosis is 2. In mitosis, a single cell divides and gives rise to two genetically similar cells. The number of nuclei formed in meiosis is 4. In meiosis, one cell divides first by reduction division and form two haploid cells ant then these haploid cells undergo mitosis to give rise to four haploid cells.
The number of chromosomes in mitosis remains the same in daughter cells in mitosis because the DNA is replicated in the interphase of mitosis so that chromosome number is not reduced during mitosis. The number of chromosomes is reduced to half in meiosis. There is not DNA replication in the interphase of reduction division.
How do you feel about the way people worldwide view the problem of Climate Change?
Answer:
There is a wide range of views on climate change across the world. While many people understand and acknowledge the scientific evidence that climate change is happening and that human activities are contributing to it, others are more skeptical and deny the reality of climate change altogether. Some people may also acknowledge climate change but are unsure of how to address it, while others may recognize the issue but feel that it is not a priority compared to other pressing problems.
Overall, the level of concern and action taken on climate change varies greatly between different countries and communities. Some countries have made significant strides in reducing their carbon emissions and adopting more sustainable practices, while others have been slower to act or have even actively resisted climate action.
It is clear, however, that climate change is a global problem that affects us all, and concerted global action is needed to mitigate its effects and ensure a sustainable future for all.
Reviewing Key Concepts: Major Evolutionary Milestones
Answer:
Porifera Sponges - Multicellular
Cnidaria Jellies- True tissues
Platyhelminthes Flatworms
Bilateral symmetry, Cephalization, Triploblastic
Nematoda Round Worms - Body Cavity
Mollusca Mollusks - Body Cavity, Nervous systems, Messenteries
Annelida True Worms - Segmentation, Specialization of gut areas
Arthropoda Buggity Bugs - Jointed appendages, Highly developed cephalization
Echinodermata Sea(stars, urchins, cucumbers) -Deuterostome development
Chordata and Subphylum Vertebrata - Internal skeletal support
Agnatha - Endoskeleton, Cranium
Chondrichthyes - Jaws, Paired fins
Osteichthyes - Calcified bones, Lateral lines
Amphibia - Supportive limbs, Double loop circulation, Lungs, Tympanum
Reptilia - Amniotic egg, Watertight skin, Alveoli, Heart with ventricular septum
Aves - Endothermy, Feathers, Hard shelled egg, Flight adaptations
Mammalia -Mammary glands, Highly developed brains
Explanation:
Hope this helps
Major Evolutionary Milestones are:
4.6 Billions years ago (BYA) - origin of Earth3.5 BYA= first life exist2.1 BYA= Eukaryotes exist1.2 BYA= Multicellular life occurs0.6 BYA= first animals occur0.5 BYA= Life move on land0.02BYA= Human beings occurIt is generally accepted that the Major Evolutionary Milestones of contemporary humans from our archaic ancestor involves four main stages:
Developing territorialityBipedalismA huge brain (encephalization)Civilization.These are the Hadean (4.6–4 billion years ago), Archean (2.5–4 billion years ago), Proterozoic (2.5–541 million years ago), and Phanerozoic (4.4–4.6 billion years ago) (541 million years ago to the present).
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1. In the 1930s the theory of continental drift was formed.
A. What is the theory of continental drift? (2 points)
B. Who created this theory? (2 points)
C. What are two forms of evidence used to support this theory? (4 points)
Answer/ Explanation:
A. Continental drift refers to the movement of continents spreading apart from one another, where they once were one large landmass. This landmass was called Pangea.
B. The creator of the theory is Alfred Wegener.
C. The evidence for continental drift included the fit of the continents; the distribution of ancient fossils, rocks, and mountain ranges; and the locations of ancient climatic zones.
Discuss the function of non-algae plants in the ocean
Marine plants similar to alge help provide sutanacne and shelter to marine life. but they are not just importiant to aquatic ecosystems; they provide about 70-80 percent of the oxygen on earth, making them extremly importiant to our everyday lives as well! marine plant and alge are both different and similar to their cousins on land: like terrestrial plants they rely on sunlight, so they are usally only found at depths were at least some light can penetrait.
i hope this helps!
happy st patricks day have a good day
Non-algae plants in the ocean, particularly seagrasses and mangroves, provide critical habitats for marine species, improve water clarity, protect coastal areas, and prevent erosion.
Explanation:Non-algae plants in the ocean, specifically seagrasses and mangroves, play vital roles in marine ecosystems. Seagrasses provide a habitat for many marine creatures including fish and invertebrates, acting as a nursery ground for young organisms. They also contribute to water clarity by helping to bind the sediment.
Mangroves, on the other hand, act as a buffer zone protecting the coastal areas from strong waves and winds. They prevent erosion and contribute to the stability of the shoreline. Mangroves is also a critical habitat for various forms of wildlife and serve as a breeding ground for a multitude of marine species.
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List and briefly describe at least 5 fine motor skills and at least 5 gross motor skills that you've used within the last few days.
5 fine motor skills are typing, writing, cutting, zipping, threading and 5 gross motor skills that you've used within the last few days are walking, running, jumping, throwing, catching.
What is motor skills?Motor skills are the physical abilities that involve movement of the body and its parts. These skills involve coordination, control, dexterity, and balance. Motor skills can be divided into two categories: gross motor skills, which involve the larger movements of the body, such as running and jumping, and fine motor skills, which involve the smaller movements of the body, such as picking up an object or writing.
Fine Motor Skills:
1. Typing - Using my fingers to type on a keyboard.
2. Writing - Using a pen or pencil to write words or draw pictures.
3. Cutting - Using scissors to cut shapes or designs.
4. Zipping - Using my fingers to zip up a zipper.
5. Threading - Using my fingers to thread a needle.
Gross Motor Skills:
1. Walking - Moving my legs to walk from one place to another.
2. Running - Moving my legs quickly to cover a greater distance.
3. Jumping - Using my legs to propel myself up and off the ground.
4. Throwing - Using my arms to throw a ball.
5. Catching - Using my arms and hands to catch a ball.
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Identify which organism would be the least common and explain why
Answer:
Organisms at the top of the food chain, such as apex predators, often have smaller populations because they require more resources to sustain themselves, and they have fewer individuals to prey on. Additionally, they may be more vulnerable to environmental disturbances or changes that affect their prey or habitat.
Specialist organisms, such as those that require a specific type of food or a narrow range of environmental conditions, are also often less common than generalists that can adapt to a wider range of conditions. This is because their survival is tied to a very specific set of circumstances, and any changes to those conditions could have a significant impact on their population size.
However, it's important to note that the least common organism in a given ecosystem or community can vary widely depending on the specific context and the interactions between different species.
Explanation:
what is a nonrenewable resource ?
A- natural resource that is replaceable
B- natural resource that is limited in supply
C- existing materials that are captured through using the heat of earth
D- alternative energy forms like solar energy and wind power that can be recycled
Answer: B
Explanation:
Non-renewable energy are natural substances such as oil, natural gas, coal, and nuclear energy, that we use for energy. These substances cannot be readily replaced by natural means.
Pls help me with this plsss
The most likely cause of the changes in allele distribution is that the medium gray coloration in lizards appears to be a neutral mutant allele that allows the lizards to hide better from predators.
What is the cause of natural selection?Since black lizards are less able to hide from predators, the allele for black coloration decreases in frequency due to reduced fitness.
On the other hand, the medium gray coloration allows lizards to blend in with their environment, making them less visible to predators and increasing their chances of survival.
Therefore, the frequency of the gray allele increases over time as natural selection favors individuals with this allele.
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how are mutation and sexual reproduction involved in creating and maintaining variation in a population
Answer:
Mutation and sexual reproduction are two essential processes that contribute to creating and maintaining variation in a population.
Mutation is the ultimate source of genetic variation in a population. It is a random process that generates new alleles or genetic variations in an organism's DNA. Mutations can arise due to various factors such as exposure to radiation, chemicals, or errors during DNA replication. These mutations can be beneficial, harmful, or neutral, and they can change the physical traits of an individual.
Sexual reproduction involves the fusion of gametes from two parents to produce offspring that inherit traits from both parents. The process involves the mixing and recombination of genetic information from each parent, resulting in a unique combination of genes in the offspring. Sexual reproduction can introduce new genetic variations into the population and shuffle existing genetic variations, resulting in an increase in genetic diversity.
Both mutation and sexual reproduction work together to create and maintain genetic variation in a population. Mutations provide the raw material for genetic variation, while sexual reproduction shuffles and recombines this variation. The combination of these two processes leads to the creation of unique genetic combinations, which can help populations adapt to changing environmental conditions and evolve over time.
Explanation:
please help quick!!
Considering the steps of meiosis, identify the correct number of chromosomes present at the beginning of meiosis I, interkinesis, and in the daughter cells at the end of meiosis II.
92, 46, 23
92, 46, 46
46, 23, 12
46, 92, 23
6) The pattern of earthquake foci shown in the cross-
section to the right outlines a(n): a) triple point
b) divergent plate boundary c) oceanic ridge
d) Benioff zone e) oceanic trench
The image's distribution of earthquake foci indicates that the quakes are likely happening deep within a dipping zone, which is consistent with a subduction zone.
How would you characterise the depth distribution of earthquakes?This 0–700 km earthquake depth range is classified into three zones for scientific analysis: shallow, middle, and deep. Deep earthquakes range in depth from 300 to 700 km, whereas moderate earthquakes occur between 70 and 300 km deep.
What are earthquakes in subduction zones?Plate tectonic boundaries known as subduction zones are formed when two plates converge and one plate is driven beneath the other. Geohazards like earthquakes and volcanoes are produced as a result of this process.
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