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Answer: 4. mating of related individuals of same breed.

Key idea: Inbreeding increases homozygosity.

Mating of closely related individuals of the same breed for several generations gives pure lines (homozygous), at the risk of inbreeding depression. Mating unrelated animals or different breeds or species produces heterozygous offspring (outcrossing, crossbreeding, interspecific hybridisation). Answer: (4).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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