The northern red-legged frog, or Rana aurora , is found along the western coast from British Columbia to Northern California. Their typical breeding season lasts from January to March. The foothill yellow-legged frog, or Rana boylii , is found along the western coast from northern Oregon to central California. Their typical breeding season lasts from April to July. What mechanism might keep Rana aurora and Rana boylii from mating?
Two species of flies, Drosophila melanogaster and Drosophila simulans , can mate. They usually do not mate, however, even if they are kept together in a laboratory. Males court the females of both species, but the females prefer to mate with males of their own species. Which isolating mechanism does this describe?
A student argues that being separated geographically is the only way for speciation to occur. Why is he wrong?
Which of these is the best definition of biogeographic isolation?
Gentoo penguins present a potential mate with a pebble. Emperor penguins have a specific call and movement that they make to attract a mate. Which type of isolation do these penguins demonstrate?
Cardueline finches can be found in many areas of the world, including North America and Asia. Hawaiian honeycreepers, which are found only in Hawaii, have been found to have DNA commonalities with this group of finches that indicate they have a common ancestor. Which mechanism might have led to the appearance of the Hawaiian honeycreeper?
Which is most likely to happen to a population that becomes anatomically isolated from the rest of its species?
Which of these must occur for speciation to happen?
Darwin hypothesized that new species could appear gradually through small changes in an ancestral species. Which observation that he made about finches most supports that hypothesis?
Which of these could result in speciation from biogeographic isolation?
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