What role do prezygotic and postzygotic barriers play in speciation? a. Prezygotic and postzygotic barriers allow for the formation of less-fit hybrids that reinforces speciation. b. Prezygotic and postzygotic barriers prevent interbreeding of species such that there is no gene flow between them. c. Prezygotic and postzygotic barriers prevent migration of the two species, causing them to remain in contact with each other and begin to interbreed. d. Prezygotic and postzygotic barriers are present only in newly-formed species, allowing scientists to identify the time of divergence of the species.
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Prezygotic barriers are barriers that prevent mating or fertilization between different species, while postzygotic barriers are barriers that occur after fertilization, such as reduced hybrid viability or fertility. Show more…
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Prezygotic and postzygotic barriers to reproduction have the effect of a. reducing genetic differences between populations. b. increasing the chance of hybridization. c. preventing speciation. d. reducing or preventing gene flow between species.
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 barriers would lessen and the two parent species would fuse.
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