Speciation

AP Biology· difficulty 3/5

The bar chart shows reproductive isolating barriers separating two closely related species, ordered prezygotic to postzygotic.

Two species mate but produce sterile hybrid offspring. Which barrier is acting?

A
$Behavioral$
B
$Postzygotic (hybrid sterility)$
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C
$Gametic$
D
$Temporal$

Explanation

Hybrid sterility occurs after fertilization and zygote formation, making it postzygotic. Examples include the mule (horse x donkey).

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