23. Speciation

Which of the following is NOT a common mechanism by which populations become reproductively isolated, leading to speciation?

Which of the following correctly links geographic isolation to speciation?

Which of the following is an example of reproductive isolation?

What is behavioral isolation in the context of speciation?

Which of the following is NOT an example of a prezygotic barrier to reproduction?

Which of the following is NOT a common mechanism by which species become reproductively isolated and form new species?

Which of the following must be true for allopatric speciation to occur?

How does temporal isolation prevent successful interbreeding among members of different species?

Which type of reproductive isolation most likely played a significant role in the speciation of Galápagos finches?

Which of the following most consistently leads to speciation?

When gene flow between two populations ceases, the potential for __________ exists.

Bird guides once listed the myrtle warbler and Audubon's warbler as distinct species that lived side by side in parts of their ranges. However, recent books show them as eastern and western forms of a single species, the yellow-rumped warbler. Apparently, the myrtle warbler and Audubon's warbler __________.

Imagine that part of a population of South American finches is blown by a storm onto an island far offshore and manages to survive and reproduce there for a period of 10,000 years. After that period, a climate change results in lower sea levels and the reconnection of the island with the mainland. Members of the formerly isolated island finch population can now interact freely with members of the original mainland population. Which of the following observations would, by itself, lead you to conclude unequivocally that the island finch population had evolved into a distinct species, according to the biological species concept?

At which point in the adaptation of a population is it clear that speciation has occurred?