Question

9 Populations evolve for many reasons. Suppose there is a small population of birds that have either brown chest feathers or yellow chest feathers, and the Question Not yet answered allele for the brown feathers is dominant. The frequencies for the two alleles in the population are approximately equal Points out of 1.00 For each event or condition described below, answer the following questions. P Flag question o What mechanism? Identify whether the event is natural selection, genetic drift, or gene flow. o Gene pool effect. Select the best description of how the allele frequencies change. A. Birds with yellow chest feathers attract more mates and leave more offspring. What mechanism is in work here? genetic drift O gene flow O natural selection What is the effect on the gene pool? O allele frequencies stay the same O frequency of yellow feather alleles increase O allele frequencies change, but not predictably O frequency of brown feather alleles increase B. A hurricane kills many birds at random. What mechanism is in work here? gene flow O genetic drift O natural selection What is the effect on the gene pool? O equency of brown feather alleles increase o frequency of yellow feather alleles increase allele frequencies stay the same O allele frequencies change, but not predictably

Answer 1

1) Since the birds with brown chest feather alleles are dominant in the population. But as the question says that birds with yellow chest feathers attract more males and leaves more offsprings that indicate that it is because of natural selection. As a consequence of natural selection, a particular species become better adapted to their environment in order to survive and reproduce more than those less adapted to their environment.

The effect on the gene pool is that the frequency of the yellow feather alleles increases in the population.

If a hurricane kills many birds in the population randomly, that clearly indicates there is a sudden change in the gene frequency in the population, that is called as genetic drift.

The effect is that the allele frequencies change but not predictably.