Heterosis in F2 Generation Compared to F1
Heterosis in the F₂ generation becomes:
- Same as F1 generation
- Double of F1 generation
- Half of F1 generation — Correct Answer
- Absent in F2 generation
Explanation:
Correct Answer: Half of F1 generation
Heterosis in F₂ is reduced to 50% of the F₁ generation due to inter-se mating (F₁ × F₁), which reduces heterozygosity by 50% each generation.
Key Facts about Heterosis / Hybrid Vigour
- Coined by G.H. Shull.
- Depends on extent of heterozygosity and non-additive gene action (Dominance, Over-dominance, Epistasis).
- Maximum hybrid vigour is obtained in F1 generation.
- Traits with low h² show high degree of heterosis (e.g., reproductive traits).
- Commonly used in broiler, layer, swine, and sheep production.
📚 About this Topic — Animal Genetics & Breeding
This multiple choice question is from Animal Genetics & Breeding, Animal Refresher. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Genetics & Breeding to strengthen your preparation.
