3.) If a population experiences no migration, is very large, has no mutations, h

Question

3.) If a population experiences no migration, is very large, has no mutations, has random mating, and there is no selection, which of the following would you predict?

A .The makeup of the population’s gene pool will remain virtually the same as long as these conditions hold

b. The population will evolve, but much more slowly than normal

c. Dominant alleles in the population’s gene pool will slowly increase in frequency while recessive alleles will decrease

d. The composition of the population’s gene pool will change slowly in a predictable manner

e. The population probably has an equal frequency of A and a alleles

4. Which of the following occurs with disruptive selection

a. Natural selection favors phenotypes of one extreme, resulting in a population mean shift over several generations

b. Natural selection favors phenotypes of both extremes, resulting in an increase in intermediate phenotypes over time

c. Natural selection favors phenotype values near the population mean, resulting in no shift in mean trait value over time and a more narrow bell curve

d. Natural selection selects against trait values that are close to the population mean, resulting in a bimodal distribution of trait values

Explanation / Answer

3)

When the population experiences no migration, mutation and selection, moreover ppopulation experiences random mating and is very large then the initial allele frequencies in the population gene pool remain constant for several generations but the frequency of dominant alleles is not equal to recessive alleles in all generations. Option e is correct.

4)

In disruption selection, extreme values of a trait (higher or lower) are favored over intermediate values. The variance of trait increases resulting in population divided into two distinct group. Option b is correct.

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