Multiple choice

Hybrid breakdown is failure of

  1. hybrid zygote to develop into offspring

  2. hybrid adult to produce fertile offspring

  3. fusion failure of ova and sperms of two species

  4. all the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hybrid breakdown is a post-zygotic reproductive isolation mechanism where the first-generation hybrids are viable and fertile, but the subsequent generations (F2 or backcrosses) are feeble or sterile. This prevents gene flow between the two parent species.

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