Suppose that the natural ranges of horses and donkeys were to overlap. Which of the following statements best describes what would likely happen to the populations over time? a) The hybrid offspring (mules) would become widespread and mate with members of both populations. b) The hybrid offspring would mate with other hybrid offspring to produce viable offspring. c) The hybrid offspring would be less reproductively fit, and reinforcement could strengthen postzygotic barriers. d) Eventually, all members of both populations would be hybrids. e) The hybrid offspring would be less reproductively fit, and reinforcement could strengthen prezygotic barriers.
Added by Ricky N.
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Step 1: The hybrid offspring (mules) resulting from the overlap of horse and donkey populations would likely be less reproductively fit due to their infertility. Show more…
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What prevents horses and donkeys from hybridizing to form a new species? a. limited hybrid fertility b. limited hybrid viability c. hybrid breakdown d. gametic isolation
C D.
When hybrids produced in a hybrid zone can breed with each other and with both parent species, and they survive and reproduce as well as members of the parent species, one would predict that a. the hybrid zone would be stable. b. sympatric speciation would occur. c. reinforcement of reproductive barriers would keep the parent species separate. d. reproductive barricrs would lessen and the two parent species would fuse.
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