When two unrelated individuals or lines are crossed, performance of F₁ hybrid is often superior to

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4.Principles of Inheritance and Variation

normal

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

heterosis

transformation

splicing

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