SAT Subject Biology Practice Question 468: Answer and Explanation

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Question: 468

18. 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.

A similarity between Situation 1 and Situation 2 is

A. reproductive isolation
B. genetic drift
C. increased fitness
D. geographic separation
E. competition

Correct Answer: A

Explanation:

A Of the choices given, the only one the two groups have in common is that they are now reproductively isolated-in other words, they are no longer able to interbreed. Genetic drift (choice B) occurs when random events eliminate certain genes from a population; this has not occurred in either situation. Increased fitness (choice C) may have occurred with the moths in the first situation, but not with the frogs in the second. Geographic separation (choice D) occurred with the frogs, but not with the moths, and competition (choice E) is not mentioned in either situation.

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