23. Speciation

Which of the following are prevented by prezygotic isolating mechanisms?

Which of the following must occur for speciation to happen?

Reproductive isolation is necessary for __________ to occur.

Which event would most likely cause geographic isolation in a population?

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

Two species of water lilies in the same pond do not interbreed because one blooms at night and the other during the day. The reproductive barrier between them is an example of __________.

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 __________.

The Galápagos finches collected by Darwin are thought to have descended from a very small parent population. Different species of finches that are confined to only one or two islands most likely arose by __________.

Which of the following best defines speciation?

How are two different species most likely to evolve from one ancestral species?

If a new species of plant is to be produced by means of allopolyploidy from two parental species that are 2n = 4 and 2n = 8, how many chromosomes would you expect in the somatic cells of the new species?

Sympatric speciation typically occurs by all of the following mechanisms except __________.

Which of the following statements most accurately applies to speciation?

There are two groups of pine trees that appear to be very similar phenotypically and genotypically. However, one releases pollen in January, when the female structures of that group are receptive, and one in March. What kind of reproductive barrier is this?

Which of the following would be an example of a prezygotic barrier?