What must occur in order for a new trait to appear in a population and then reac
ID: 252675 • Letter: W
Question
What must occur in order for a new trait to appear in a population and then reach a steady, high frequency within that population?
a
New traits appear through gene mutations or through genetic drift. In order to reach a steady, high frequency in the population, there must be many mutagens, such as UV radiation, in the environment to produce many mutations.
b
New traits appear through gene mutations or through genetic drift. In order to reach a steady, high frequency in the population, there must be a consistent source of immigrant individuals with the allele.
c
New traits appear through gene mutations or through evolution. In order to reach a steady, high frequency in the population, the allele must code for a favorable adaptation.
d
New traits appear through gene mutations or through gene flow. In order to reach a steady, high frequency in the population, the trait associated with the gene must be favored by either natural or sexual selection.
Explanation / Answer
ANSWER is:
D) New traits appear through gene mutations or through gene flow. In order to reach a steady, high frequency in the population, the trait associated with the gene must be favored by either natural or sexual selection.
EXPLANATION:
Genetic variation is defined as measure of the variation that occurs in the genetic makeup of individuals within population.
Causes for a new trait to appear in a population are through:
- Mutation : it can create entirely new alleles in a population.
- Gene flow : it is important for transferring genetic diversity among populations. Migrants into or out of a population result in a change in allele frequencies that change genetic diversity within the populations.
- random mating
- random fertilization
- recombination between homologous chromosomes during meiosis that reshuffles alleles within an organism offspring.
New trait then reach a steady, high frequency within that population through natural selection.
The genetic preservation of the characteristics that increase the survival and reproduction of some individuals within a population through process of natural selection.
Genetic variation allows natural selection to increase or decrease frequency of alleles in the population.
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