Exam 18: Emergence of Evolutionary Thought

Suppose that you have a population of guinea pigs in which two-thirds of the alleles for coat color specify black, and one-third specify white.According to the Hardy-Weinberg rule, what will be the ratio of these alleles in the gene pool in future generations, provided all the guinea pigs reproduce?

All EXCEPT which of the following is a possible bottleneck for a population?

Directional selection occurs when

Which of the following is NOT a major process of microevolution?

Which of the following explains why archipelago islands are so important to the study of allopatric speciation?

Which of the following is the best definition of sympatric speciation?

Stabilizing selection occurs when

Members of the same species must

In a certain bird species, clutch size (the number of eggs laid by a female at one time) ranges from four to eight, and the most frequent clutch size is six.This phenomenon is an example of

The introduction of a small population onto an island that results in a limited gene pool is an example of

The persistence of the sickle-cell anemia allele in the African population is the result of

Sympatric speciation occurs

The famous "bell-shaped curve" that usually results when test scores are plotted against number of students is an example of what type of selection?

Allopatric speciation is most commonly caused by

What aspect of a population is critical in determining a species in Ernst Mayer's "biological species concept"?

Gene flow

When DDT was first introduced, insects were very susceptible to it.The development of resistance to DDT by insects was the result of

For most species that exhibit sexual dimorphism the selection of a mate is the responsibility of the

If the frequency of expression of a recessive trait in a population is 16 percent, the frequency of the recessive allele is what percent?

In humans, only identical twins have the same