Bio 2 Chapter 22 Practice Exam

Which of the following factors would not contribute to allopatric speciation?

Gene flow between the two populations is extensive

Bird guides once listed the myrtle warbler and Audubon's warbler as distinct species. Recently, these birds have been reclassified as eastern and western forms of a single species, the yellow-rumped warbler. Which of the following pieces of evidence, if true, would be cause for this reclassification?

The two forms interbreed often in nature, and their offspring survive and reproduce well

A hybrid zone is properly defined as

an area where mating occurs between members of two closely related species, producing viable offspring.

What does the biological species concept use as the primary criterion for determining species boundaries?

gene flow

According to the concept of punctuated equilibrium, the "sudden" appearance of a new species in the fossil record means that

speciation occurred rapidly in geologic time.

Beetle pollinators of a particular plant are attracted to its flowers' bright orange color. The beetles not only pollinate the flowers, but they mate while inside of the flowers. A mutant version of the plant with red flowers becomes more common with the passage of time. A particular variant of the beetle prefers the red flowers to the orange flowers. Over time, these two beetle variants diverge from each other to such an extent that interbreeding is no longer possible. What kind of speciation has occurred in this example, and what has driven it?

sympatric speciation; habitat isolation