Biology / Unit 8 Bio 1723 short lesson, about 20 seconds
Hybrid Inviability and Hybrid Sterility
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The idea
Hybrid inviability is a postzygotic barrier where a hybrid fails to survive to maturity; hybrid sterility is where a surviving hybrid cannot reproduce.
In practice
A hybrid embryo that dies before birth shows inviability, while a mule, viable but sterile, shows sterility instead.
Where people slip
Inviability blocks the hybrid from surviving at all — sterility lets it survive but blocks reproduction, a different failure point.
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