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4.Principles of Inheritance and Variation
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When two unrelated individuals or lines are crossed, the performance of $F_1$ hybrid is often superior to both its parents. This phenomenon is called
A
heterosis
B
transformation
C
splicing
D
metamorphosis.
(AIPMT-2011)
Solution
(a): The increased vigour displayed by the offspring from a cross between genetically different parents is called heterosis. Hybrids from crosses between different crop varieties $(F_1$ hybrids) are oftenstronger and produce better yields than the original varieties.
Standard 12
Biology
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