SME
Evolutionary Biology
Speciation
Use this for “Two frog species breed in the same ponds, one in March and one in May. Is this a prezygotic or a postzygotic barrier?”
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Which kind of barrier is it?
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Ask whether a hybrid zygote ever forms.
Assumptions
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A reproductive barrier keeps two populations from exchanging genes, even where they meet.
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Prezygotic barriers act before fertilization: the pair never mates, or sperm never reaches the egg.
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Postzygotic barriers act after a hybrid zygote forms: the hybrid dies, is sterile or leaves weak offspring.
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