Question

Q.17. When two unrelated individuals or lines are crossed the performance of Fi hybrid is often
superior to both its parents. This phenomenon is called
(AIPMT 2011]
(a) heterosis
(b) transformation
(c) splicing
(d) metamorphosis​

Answer 1

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Heterosis refers to the phenomenon that progeny of diverse varieties of a species or crosses between species shows the increase in growth, size, fecundity, function, yield or other characters in hybrids over those of the parents.

Various models have been posited to explain heterosis, including dominance, overdominance, and pseudo-overdominance.

Thus, the correct answer is option A.