alleryThe superiority of a hybrid over both its parents, obtained through cross breeding, is called:
AHeterosis
BInbreeding depression
CMutation
DPolyploidy
Answer & Solution
Correct answer: A. Heterosis
1. Cross breeding of unrelated animals yields offspring stronger than their parents.
2. This superiority is named heterosis, also called hybrid vigour.
3. Inbreeding depression is the opposite, and mutation and polyploidy are unrelated phenomena, so B, C and D are wrong.
4. Hence the answer is A.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit "Breeding and Biotechnology", p.298_
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