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Question

Heterosis is


A
Hybrid incompatibility
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B
Hybrid vigour
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C
Hybrid sterility
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D
None of the above
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Solution

The correct option is B Hybrid vigour
Heterosis, also called as hybrid vigour, the increase in such characteristics as size, growth rate, fertility and yield of a hybrid organism over those of its parents. Plant and animal breeders exploit heterosis by mating two different pure-bred lines, that have certain desirable traits. The first-generation offspring generally show, in greater measure, the desired characteristics of both parents. This vigour may decrease, however, if the hybrids are mated together. So the parental lines must be maintained and crossed for each new crop or group desired. The increase in heterozygosity is the under laying cause of hybrid vigour. 

Biology

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