Question

7. A small population of animals is likely to experience a change in allele frequencies in its gene pool if ____? a)each individual has an equal chance of reproducing b) a natural disaster kills a portion of the population at randon c)the population is geographically isolated from other populations

8. Two populations of crickets have stopped interbreeding over time, although they reside in the same geographic region. What is one possible explanation? a) they have experienced reinforcement becuase of a reconnection at a hybrid zone b) they have developed a temporal isolation, a kind of prezgotic barner c) postzgotic barriers prevent fertilization events from occuring

9. The wisent, or European bison, shown here was popular for hunting in the early twentieth century. While wisent populations have since recovered, at their smallest, they totaled 19 individuals. Existing wisent are, therefore, most likely to show which of the following? a) low genetic, diversity due to genetic drift b) new alleles due to a population bottleneck c) harmful mutations due to netural selection

Answer 1

7. b) a natural disaster kills a portion of the population at random. There is good chance of loss of some alleles resulting in change in allelic frequencies due to chance event.

8. b) they have developed a temporal isolation, a kind of prezgotic barner. Temporal Isolation is a type of prezygotic barrier in which species cannot mix their gametes when they breed during different times of the day, seasons or years.

9. a) low genetic, diversity due to genetic drift. The remaining population will show population bottleneck and hence extensive inbreeding to increase the population. It may be accompanied by loss of some alleles, and inbreeding will cause genetic drift and hence very low genetic diversity.