Which of the following would you predict would evolve in guppies that are taken from streams in Trinidad with predators and put into streams lacking predators?
A) Male guppies will become less colorful.
B) Male guppies will become more colorful.
C) Guppies would evolve to have females avoid more colorful males.
D) Male guppies will not change in coloration.
E) Guppies would evolve to have females prefer less colorful males.

Question

Quizplus · Accepted Answer

In environments without predators, male guppies tend to evolve to become more colorful. This is because, in the absence of predators, the cost of being colorful (e.g., being more visible to predators) is reduced, allowing males to use bright colors to attract females without increased risk of predation. Bright coloration in male guppies is typically a signal of fitness and is used to attract females for mating.

Which of the Following Would You Predict Would Evolve in Guppies