35. Is there any time when genetic drift is not acting? 36. Distinguish between
ID: 178591 • Letter: 3
Question
35. Is there any time when genetic drift is not acting?
36. Distinguish between genetic drift and migration.
37. Distinguish between directional, disruptive, and stabilizing selection. What is a selection pressure? Does it act on an individual or population? What happens to gene frequencies under these different types of selection?
38. What is Vg and how does it relate to Ve? How do they both interact to produce a phenotype?
39. How does Vg affect the strength of selection?
40. What does descent with modification mean?
Explanation / Answer
35. Genetic drift will act most of the time, only the effect will see a change if there are large number of copies of allele, the effect will be less.
36.Genetic drift is the alteration in the genetic composition of the finite population due to substitution of alleles across the generations; Migration is the exchange of genes among different populations causing changes.
37. All three are modes of natural selection.
In a directional selection, shifting of allele frequency is continuous and unidirectional due to favoring of a single phenotype; in a disrutive selection, extreme values of traits are favored and in a stabilizing selection, the genetic diversity is inversely proportional to the stability of a population on a specific value of trait.
Selection pressure is an abstract change that brings about differential mortality or fertility that allows the population to change genetically. It acts on a population.
Natural selection increases the frequency of alleles if they are beneficial for the reproductive and survival abilities, and vice-versa
38. Vg is the total genetic variance.
Vg= Vp-Ve; Vp= total phenotypic variance, Ve= environmental variance
39. Additive effect on the qualitative trait, and better gene interaction.
40. Descent with modification means inheritence of traits from parents to childrens.
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