Hybrid inviability and hybrid infertility are two examples of Blank______.Multiple choice question.non-adaptive isolating mechanismsprezygotic isolating mechanismspostzygotic isolating mechanismsnon-zygotic isolating mechanisms

When populations are only partially reproductively isolated, which of the following may occur?Multiple choice question.Postzygotic isolating mechanisms will act to prevent the survival and reproduction of hybrid offspring if a zygote is formed.Even though individuals are interbreeding, prezygotic and postzygotic isolating mechanisms ensure that hybrids do not survive and reproduce.Prezygotic isolating mechanisms will act to prevent the formation of a zygote if postzygotic isolating mechanisms fail.Despite prezygotic and postzygotic isolating mechanisms, some individuals may survive and reproduce.Need help? Review these concept resources.

How do postzygotic isolating mechanisms prevent successful interspecies hybridization?Multiple choice question.The egg cannot be fertilized by sperm of another species following a successful mating attempt.Members of different species attempt to mate but are unsuccessful due to anatomical differences.Although fertilization is successful, the resulting hybrid is unable to develop or reproduce.Members of different species come into contact, but do not recognize one another as potential mates.

If two reproductively isolated populations re-establish contact, Blank______ will tend to increase differences between the populations, and Blank______ will tend to decrease differences between the populations.Multiple choice question.hybrid infertility; hybrid inviabilityhybrid inviability; hybrid infertilityreinforcement; gene flowgene flow; reinforcement

Which of the following is the process in which traits that increase prezygotic isolation between two differentiated populations are favored due to natural selection against the production of unfit hybrids?Multiple choice question.EvolutionFertilizationMutationReinforcement

Some biologists believe that the term "isolating mechanisms" is confusing because it implies that traits evolved to isolate species, whereas in most cases, traits that reproductively isolate species Blank______.Multiple choice question.are the product of hybridization between individuals of partially reproductively isolated populationsare the incidental consequence of natural selection for adaptation to particular environmentsare the result of increased gene flow between different populationsevolve due to the founder effect