Question

Hybrid vigour or heterosis is a phenomenon widely exploited in crop improvement, especially in maize, rice and several vegetables. How is heterosis generally expressed?

Q: Answer-Hybrid vigour or heterosis is a phenomenon widely exploited in crop improvement, especially in maize...

Explanation Heterosis is the superior performance of a hybrid over its parents.

A Inferiority of hybrid over both parents in yield and vigour

B Superiority of a hybrid over its parents in yield, vigour or adaptability

C Complete loss of genetic variation in subsequent generations

D Absence of cross-pollination between different varieties

E Permanent sterility in all crops without exception

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