What is hybrid breakdown a failure of?

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(B) Hybrid breakdown is a type of reproductive isolation where the $F_1$ hybrids are viable and fertile,but their offspring (the $F_2$ generation) are

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Hybrid adult to produce fertile offspring

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(B) Hybrid breakdown is a type of reproductive isolation where the $F_1$ hybrids are viable and fertile,but their offspring (the $F_2$ generation) are feeble or sterile.This means the failure occurs in the ability of the hybrid to produce viable and fertile offspring in subsequent generations.Therefore,it is a failure of the hybrid adult to produce fertile offspring.

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