SAT Subject Biology Practice Question 469: Answer and Explanation
19. Situation 1: A species of moth is preyed on by bats. Over hundreds and hundreds of years, the moths develop a sophisticated pattern of flying when they hear the screech of a bat. This helps them escape danger. Other changes occur as well, and when an attempt is made to mate the current moth with its ancestor moth, no viable eggs are produced.
Situation 2: A species of frogs is living in a pond near an earthquake fault line. A sizable earthquake separates the frog population into two separate populations. After hundreds and hundreds of years, the two groups are unable to mate.
Another term used to describe what happened in Situation 2 is
A. survival of the fittest
B. convergent evolution
C. divergent evolution
D. stabilizing selection
E. directional selection
Correct Answer: C
C Divergent evolution often leads to speciation (C is correct, and B, the opposite, can be eliminated). Survival of the fittest (choice A) may have occurred but is not stated so specifically in the passage. Stabilizing selection (choice D) and directional selection (choice E) happen to a single population and usually do not separate it into two new species.