Question

Darwin's studies of Galapagos finches are well known in the study of evolution. These studies have been instrumental in helping us understand how new species evolved from pre-existing species. Which statement is true about the speciation of the Galapagos finches?
Responses
A The finches evolved traits to help them survive in different environments.The finches evolved traits to help them survive in different environments.
B The finches had different traits that influenced the environment in which they chose to live.The finches had different traits that influenced the environment in which they chose to live.
C Genetic variation occurred amongst the finches, giving some a genetic advantage in a changing environment, allowing them to better survive.Genetic variation occurred amongst the finches, giving some a genetic advantage in a changing environment, allowing them to better survive.
D Members of the original population evolved in such a way that it became impossible for individuals from the two new populations to interbreed.

Answer 1

Correct answer: D

Explanation: Speciation means one population diverges into two (or more) populations that can no longer interbreed (reproductive isolation). Darwin’s finches also show the processes that lead to that: genetic variation (C) and evolution of different adaptive traits (A) were important, but the defining outcome of speciation is the loss of interbreeding ability described in D.