Question

question 1 of 10
guppies are small fish that live in freshwater streams. there are many different variants of guppies. colorful male variants are more likely to attract females but are slower to swim away from predators. less colorful variants are less likely to attract females but are faster swimmers.
which two statements describe how a population of guppies is likely to change if their main predator is removed from the stream?
a. the dull variant will be more likely to reproduce, so that variant will become more common.
b. the colorful variant will be more likely to survive and reproduce, so that variant will become more common.
c. the dull variant will be less likely to reproduce, so that variant will become less common.
d. the colorful variant will be less likely to survive and reproduce, so that variant will become less common.

Explanation:

Step1: Analyze the effect of predator removal

When the main predator is removed, the advantage of the dull variant (faster swimmers to escape predators) is gone.

Step2: Consider reproductive success

Colorful variants are more likely to attract females. With no predator pressure, they can focus on reproduction. Dull variants, which were only good at escaping predators (now not needed as much), will have less reproductive success as they are less attractive to females. So, colorful variants will thrive (more common) and dull variants will decline (less common).

Answer:

B. The colorful variant will be more likely to survive and reproduce, so that variant will become more common.
C. The dull variant will be less likely to reproduce, so that variant will become less common.