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In peas, a gene controls flower color such that R = purple and r = white. In an isolated pea patch, there are 36 purple flowers and 64 white flowers. Assuming Hardy-Weinberg equilibrium, what is the value of q for this population?

a. 0.60
b. 0.80
c. 0.75
d. 0.64

Evolutionary progress that is slow and steady is known as

a. punctuated equilibrium
b. sympatric speciation
c. gradualism
d. reproductive isolation

Two species of frogs belonging to the same genus occasionally mate, but the offspring do not complete development. What is the mechanism for keeping the two frog species separate?

a. adaptation
b. the prezygotic barrier called hybrid sterility
c. the postzygotic barrier called hybrid inviability
d. the postzygotic barrier called hybrid breakdown

Even in Darwin's time, the blending hypothesis was incompatible with observed facts. If the blending hypothesis were true, then what should one expect to observe over the course of generations?

a. Genetic polymorphisms should increase.
b. Members of a breeding population should become more uniform in phenotype
c. Phenotypic polymorphisms should increase
d. Neutral variation should decrease.