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6 Explain why evolution by natural selection can not occur if the variation in a characteristic does not contribute to differences in fitness?
If there is not reproductive fitness conveyed by a variant trait, then natural selection has nothing to select and nothing to promote into the populational gene pool.
What role do alleles play in natural selection?
Genes are the medium by which inherited traits are passed on to offspring. It is inherited traits, and thus genes, that receive positive or negative selection.
Natural selection acts on variation by?
Natural selection acts on variation by picking out from a population's gene pool those that are more fit to survive. More variation leads to more natural selection. For example, currently endangered cheetas are found out to have less genetic variation than other animals. As a result, if a disatrouous event occured, there are no genes that could help the cheetas survived. Thus, natural selection prevent the cheetas from reproducing as a population and they become extinct.
Is the population bottleneck an example of natural selection?
No. Population bottleneck refers to a period in which the size of a population becomes much reduced, thereby reducing the number of alleles in the gene pool - and thus genetic diversity.
What is being selected in natural selection?
The individual, or the genes of the individual. All organisms are variants in phenotype and behavior. So, natural selection is the immediate environment these organisms are in and those that survive and reproduce better in this environment leave more descendants which carry the genes that promoted that survival and reproduction advantage. Then those genes are more represented in the populations gene pool and this is evolution.
What changes in the gene pool result in adaptation to the environment?
Natural selection
Which is a process that eliments harmful alleles from a gene pool?
natural selection
Why is it hard for natural selection to stop the declin of the cheetah population?
No genetic variation in the cheetah population gene pool, so natural selection has nothing to select from and the inbreeding depression keeps deleterious traits breeding true among cheetahs and natural selection can not eliminate them from the gene pool.
Why do you think gene pool diversity is important?
if a gene pool is restricted hereditary faults can be emphasized
What must occur for the gene pool within population to change?
natural selection or genetic drift
How do alleles influence natural selection?
It's the other way around: natural selection is the natural process that causes the frequencies of occurence of alleles in the population gene pool to shift.
What happens to unnecessary traits during the process of natural selection?
How does natural selection affect undesirable traits?
What company has the motto we'll clean out your gene pool?
This is referring to a "vanity phone number", not a real company. And the answer is that this phone number spells out (on a standard American telephone dial) the word "SELECTION-1". Natural Selection is the mechanism by which less-successful genes are eliminated from the gene pool.
How mutation can change the gene pool?
If a mutation is present in a gamete, then the mutation will enter the population's gene pool. Once it is in the gene pool, natural selection and genetic drift will influence the frequency that the mutation appears in the population.
What is a process the eliminates harmful alleles from a gene pool?
negative selection
How can genetic drift and gene flow affect natural selection?
Genetic drift can reduce genetic variation within a population, making it harder for natural selection to act upon beneficial traits. Gene flow, on the other hand, can introduce new genetic variation into a population, potentially increasing the pool of traits for natural selection to act upon. Overall, both genetic drift and gene flow can influence the effectiveness of natural selection by altering the genetic composition of populations.
What does not add new allies to a population gene pool?
Mutations that occur in individual members of a population do not add new allies to a population gene pool. Instead, new allies can be introduced through processes like gene flow, genetic drift, and natural selection.
