Terms
Dispersal
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The movement of a population across an existing physical barrier.
Gene flow
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The movement of genes through a population or
between populations through mating.
Hybrid
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The offspring of parents of two different species. Hybrids are often unable to
reproduce, whether because of ill health, deformity, or sterility.
Prezygotic isolation
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A type of reproductive isolation that occurs before the formation of a
zygote can take place. In most cases mating does not even occur. Forms of
prezygotic isolation include spatial, behavioral, mechanical and temporal
isolation.
Postzygotic isolation
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A type of reproductive isolation that occurs after members of two different
species have mated and produced a hybrid offspring. Such hybrids are
usually unable to reproduce.
Reproductive Isolation
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The inability of the individuals of a species to create offspring with
members of any other species. There are two forms: prezygotic and
postzygotic.
Vicariance
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The division of a population by the appearance of a physical barrier.
