Answer:
Selection is a directional process that leads to an increase or a decrease in the frequency of genes or genotypes. Selection is the process that increases the frequencies of plant resistance alleles in natural ecosystems through coevolution, and it is the process that increases the frequencies of virulence alleles in agricultural ecosystems during boom and bust cycles.
Selection occurs in response to a specific environmental factor. It is a central topic of population and evolutionary biology. The consequence of natural selection on the genetic structure and evolution of organisms is complicated. Natural selection can decrease the genetic variation in populations of organisms by selecting for or against a specific gene or gene combination (leading to directional selection). It can increase the genetic variation in populations by selecting for or against several genes or gene combinations (leading to disruptive selection or balancing selection). Natural selection might lead to speciation through the accumulation of adaptive genetic differences among reproductively isolated populations. Selection can also prevent speciation by homogenizing the population genetic structure across all locations.
Selection in plant pathology is mainly considered in the framework of gene-for-gene coevolution. Plant pathologists often think in terms of Van der Plank and his concept of "stabilizing selection" that would operate against pathogen strains with unnecessary virulence. As we will see shortly, Van der Plank used the wrong term, as he was actually referring to directional selection against unneeded virulence alleles.
A deleterious dominant allele would disappear more slowly from a population compared to a deleterious recessive allele.
What is a deleterious dominant allele?In the case of a deleterious dominant allele, the individual possessing the allele will always express the negative trait associated with it, making it easier to identify and potentially select against. In contrast, a deleterious recessive allele may not be expressed in individuals who carry only one copy of the allele, as the normal copy of the gene can still produce enough functional protein to mask the effects of the deleterious allele.
As a result, the deleterious recessive allele can persist in a population as carriers pass the allele on to their offspring without showing any negative effects themselves. However, over time, the recessive allele may become more common in the population, increasing the likelihood of two carriers mating and producing offspring that express the deleterious trait.
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Should this fish be named
Striped Sturgeon Pike or
Northern Zebra Trout
Summarize how plants get energy
Answer:
Plants convert energy from sunlight into sugar in a process called photosynthesis.
Explanation:
Photosynthesis uses energy from light to convert water and carbon dioxide molecules into glucose (sugar molecule) and oxygen
Answer:
Plants convert energy from sunlight
Explanation:
Before DNA replication, how many molecules of DNA make up a chromosome?
Answer:
Figure 7 The number of DNA molecules in a chromosome: (a) a chromosome prior to replication contains a single DNA molecule; (b) a chromosome that has been replicated and consists of two chromatids, each comprising a single DNA double helix molecule.
Explanation:
how many approaches are there in psychology what are they?
Which statement best summarizes the theory of evolution?
A. Living things in younger rocks are the common ancestors of those
in older rocks.
B. Fossils represent only a small percentage of all the species that
have ever lived.
C. Individual organisms can choose to adapt to their environment.
D. Natural processes cause living things on Earth to change over
time.
Answer: D.
Explanation:
HOPE THIS HELPS! ^^
Natural processes cause living things on Earth to change over time best summarizes the theory of evolution.
What is evolution?
This is the process of change in the characterstics of a species over several generations.
What is natural selection?
It is a mechanism of evolution in which organism that are more adaptable to to environment survive and pass there genes to the next generation.
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What are the three forces that drive (create and cause to continue) ocean currents?
Answer:
The rise and fall of the tides. Tides create a current in the oceans, which are strongest near the shore, and in bays and estuaries along the coast. ...
Wind. Winds drive currents that are at or near the ocean's surface. ...
Thermohaline circulation.
Explanation:
The three forces that drive (create and cause continuing) ocean currents are wind, water density differences, and tides.
What are ocean currents?Gravity, wind, and water density all contribute to the continuous, predictable, directed movement of seawater known as ocean currents. Water in the ocean can move both horizontally and vertically. Horizontal movements are referred to as currents, while vertical changes are called upwellings or dwellings.
The three main water flows in oceans are waves, tides, and ocean currents. Waves are produced by the wind's effect on the ocean's surface. The temperature difference between the warmer equator and the cooler poles causes ocean currents.
Therefore, the three factors of wind, water density variations, and tides are what drive (make, generate, and sustain) ocean currents.
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please what is the adaptive behaviour of a mosquito
A ______________ stain uses only one dye to enable the viewer to observe the size, shape, or arrangement of cells A ______________ stain uses only one dye to enable the viewer to observe the size, shape, or arrangement of cells Gram stain Simple stain Endospore stain Capsule stain
Answer:
Simple.
Explanation:
A cell can be defined as the fundamental or basic functional, structural and smallest unit of life for all living organisms. Some living organisms are unicellular while others are multicellular in nature.
A unicellular organism refers to a living organism that possess a single-cell while a multicellular organism has many (multiple) cells.
Cell staining can be defined as a method used by scientists to view the cells of living organisms and its cellular components with the aid of microscope.
A simple stain uses only one dye to enable the viewer to observe the size, shape, or arrangement of cells. It typically involves the process of soaking a smear (thin film of living microorganisms) in dye and then rinsing it afterwards in order to visualize size, shape or arrangement of cells and other cell organelles such as mitochondria, cytoplasm, nucleus, golgi apparatus etc.
Horses evolved from a foot tall, swamp dwelling, four toed, drawn horse, called the
O Equus
O Merychippus
O Oligohippus
O Pliohippus
O Eohippus
t
1
2
3
4.
Answer:
eqqus
Explanation:
Equus—the genus to which all modern equines, including horses, asses, and zebras, belong—evolved from Pliohippus some 4 million to 4.5 million years ago during the Pliocene. Equus shows even greater development of the spring mechanism in the foot and exhibits straighter and longer cheek teeth
difference between golgi apparatus and endoplatic reticulum
Answer:
Golgi apparetus helps in secretion of mucus,enzymes and hormones while endoplasmic reticulum serves as the pathway for the distribution of materials from one part of the cell to the other.
what are stem cells?
Answer:
Stem cells are cells with the potential to develop into many different types of cells in the body. They serve as a repair system for the body. There are two main types of stem cells: embryonic stem cells and adult stem cells
Explanation:
Totipotent (or Omnipotent) Stem Cells.
Pluripotent Stem Cells.
Multipotent Stem Cells.
Oligopotent Stem Cells.
Unipotent Stem Cells.
What is a substrate and how does it relate to the active site?
Answer:
a substrate is a molecule that fits perfectly into the active site
Explanation:
substrates are a perfect fit for their specific active site, in other words not just any molecule can bind with any active site.
how do flowering plants reproduce ( secually, asexually, or both
Answer: Flowering plants can reproduce both by sexual and asexual means of reproduction. Sexual reproduction involves the fusion of male and female gametes which takes place through pollination by birds, insects, and water. This pollination causes the fertilization and the female ovules grow into seeds.
Explanation: No need to thank me
Answer: Both, depending on what type of flower the plant is. Some plants reproduce asexually, while other reproduce sexually. Some plants reproduce both ways. Therefore, it depends on the type of flower/plant the flowering plant is.
I hope this helps! May I please have brainliest? :>
Please hurry and I will give out the brainliest answer!
Answer:
the apples will be red.
Explanation:
Which among the following statements is correct?
(A) Diseases caused by microbes maybe acute or chronic
(B) Diseases caused by microbes are always chronic
(C) Diseases caused by microbes are always acute
(D) None of the above
by microbes maybe acute or chronic
When reproducing, Robins (a species of bird) typically lay four eggs. Laying more eggs might result in malnourished chicks and laying fewer eggs might result in no viable offspring. This is an example of
Answer:
stabilizing selection
Explanation:
The illustration is an example of stabilizing selection.
Stabilizing selection is an evolutionary mechanism in which the extremes of traits are selected against, leading to an increase in the frequency of such traits in the population.
Laying too many eggs would lead to reduced fitness of the population of the bird as a result of malnutrition while laying too few eggs would lead to a reduction in the population. Reproduction needs to be optimized for maximum fitness.
There are different types of natural selection. One of them is stabilizing selection that favors the intermediate phenotype. The exposed scenario is an example of stabilizing selection.
Balancing selection, also called Stabilizing selection, decreases the frequency of individuals with extreme traits, and favors individual that exhibit medium-range characteristics, that gets to survive. Selective pressure is against h0m0zyg0tes, promoting genetic diversity. Genes expressing extreme characteristics in a h0m0zyg0sis are kept in a heter0zyg0us state, as a favorable adaptation to environmental conditions. In a graph, you will see that
→ The curve gets higher and thinner in the middle of the horizontal axe, indicating an increase in the heter0zyg0us genotype frequency.
→ The tails of the curve that coincides with h0m0zyg0us dominant and recessive genotypes frequencies will be near zero.
In the exposed example,
laying more than four eggs and less than four eggs are extreme phenotypes. laying four eggs is an intermediate favored phenotype.
The intermediate phenotype results in the species' fitness increase, so it is favored by natural selection.
Laying four eggs leads to well-nourished chicks, and all of them get to survive. Parents ensure their reproductive success.
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What do you expect to happen if you increase the amount of greenhouse gases in the atmosphere?
Please help ASAP!!!!!!!
I NEED THIS QUESTION SOON AS POSSIBLE
"thank for the points"
Which describes the net free water movement between the blood vessel and matrix?
a) Into vessel
b) In equilibrium
c) Out of vessel
Answer:
Out of vessel
Explanation:
the little video/diagram shows the vessles moving from inside to outside
Natural selection is when
decides who survives and who doesn't?
Answer:
Nature
Explanation:
Natural selection is when nature decides who survives and who doesn't. Therefore, option A is correct.
What is natural selection?The process through which populations of living things adapt and change is known as natural selection. A population's members are naturally varied, which means that they are all distinctive in some ways. This variety indicates that some people have characteristics that are more environment-appropriate than others.
For instance, giraffes' long necks have allowed them to consume plants that other animals cannot.
Natural selection happens when people with a particular genotype have a higher chance of surviving, reproducing, and passing on their alleles to the following generation than individuals with a different genotype. Hence, option A is correct.
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what happens to the carbon and oxygen from CO2 after it has been removed from the air by the plant via photosynthesis
Answer:
Plants absorb carbon dioxide from the air and use it to feed themselves in the process called photosynthesis. The carbon dioxide, through tiny pores called stomata, reaches the leaves of the plant. ... The factory emits Oxygen, or O2, into the ambient air until the process is finished.
Explanation:
After the removal of CO2 from air by the plant, then Carbon would be absorbed by plant, Oxygen will be emitted into the air.
Photosynthesis can be regarded as the process which involve the use of sunlight , carbon dioxide and water by plant, so that to oxygen can be created as we as energy in the form of sugar.After the absorption of the CO2 from atmosphere by plant through the stomata, the plant convert it into carbon and oxygen, and the oxygen will be released to the air.Therefore, the process is called Photosynthesis
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Emerging ____________ may result from new and/or increased exposure to animal or insect populations and can be rapidly transported to vast areas because of ____________ .
Answer:
Emerging Diseases may result from new and/or increased exposure to animal or insect populations and can be rapidly transported to vast areas because of Globalization.
Explanation:
In the last step of DNA replication, what does
the DNA polymerase do?
Answer:
Enzymes known as DNA polymerases are responsible creating the new strand by a process called elongation. ... DNA polymerase then adds pieces of DNA, called Okazaki fragments, to the strand between primers. This process of replication is discontinuous as the newly created fragments are disjointed.
Explanation:
The global fish intake for humans in a year from the ocean is equal to the organic
content produced by bacteria in the sea for -
A: 90 minutes
B: 90 days
C: 90 years
D: 90 seconds
Answer:
The answer is A:90 minutes
Which are the oldest layers of rock?
at bottom of strata
at top of strata
in middle of strata
2nd layer of strata
Answer:
Its the bottom because its located in the bottom
Explanation:
a basic law of geochronology, stating that in any undisturbed sequence of rocks deposited in layers, the youngest layer is on top and the oldest on bottom, each layer being younger than the one beneath it and older than the one above it.
What does the transfer RNA (tRNA) carry?
O Glucose
O proteins
O DNA
O Camino acids
Answer:
d,amino acids
Explanation:
tRNAs (transfer RNAs) carry amino acids to the ribosome.
based on the data for the groups of cells cultured with 0.1 serum (groups 3 to 7), identify which of the four proteins tested do(does) not appear to play a role in blocking cell cycle entry by fibroblast
Answer:
p18, p21 and p27
Explanation:
Four proteins have been obstructed in this investigation and the concentration of DNA synthesis was evaluated in various cell cultures and seeing which proteins could play a significant role in the cell cycle.
If a mother and father are both heterozygous for Brown hair (B) over blond hair (b), what will their offspring look like? on a punnett square?
Answer:
My best answer is domaint hope this helps
Explanation:
Answer:
domanit is your answer. hope this helps
a characteristic that is inherited
Answer:
Hair color, eye color
Explanation:
b) Explain how a farmer could use selective breeding to breed pigs which are very docile in
nature.
Answer:
The correct process would be :
Choose pigs that are the most docile to breed from.
In the next generation only choose docile pigs to breed from.
Carry this on for many generations until all the pigs in the herd are docile.
Explanation:
Selective breeding is the process of breeding specific parents to get specific of desired characterstics in offspring organism or crops. The selective breed takes place by selecting. It is a process that used for many years.
breeding pigs with docile characteristics would involve:
Choose pigs that are the most docile.
Breed these pigs to produce docile pigs
In the next generation only select or choose docile pigs to breed from.
repeat the process for many generations until all the pigs in the herd are docile.
An igneous rock contains one half of its original amount of K(potassium)-40. how old is the rock
Answer: 1.251 billion years
Explanation: The half-life of potassium 40 is 1.251*10^9 years. Since in the igneous rock there is one half of potassium left it means only one half-life has passed.