Components of Non-Additive Gene Action
Non-additive gene action includes-
- Dominance
- Over-dominance
- Incomplete dominance
- Epistasis
- All the above — Correct Answer
Explanation:
Correct Answer: All the above
Non-additive gene action (NAGA) includes all types of gene interaction where the phenotypic result deviates from a simple additive model.
Classification of Gene Action
| Additive Gene Action (AGA) | Non-Additive Gene Action (NAGA) |
|---|---|
| Alleles act independently; effects simply add up | Interactions cause deviation from additive expectation |
| Aa midway between AA and aa | Dominance, Over-dominance, Incomplete dominance (allelic interactions) + Epistasis (non-allelic) |
| Basis of: polygenic inheritance, GCA, resemblance between relatives, h² | Basis of: Heterosis/SCA/Inbreeding depression |
Allelic vs Non-Allelic Interactions
- Allelic (intragenic): Dominance, Incomplete dominance, Co-dominance, Over-dominance
- Non-allelic (intergenic): All forms of Epistasis
📚 About this Topic — Animal Genetics & Breeding
This multiple choice question is from Animal Genetics & Breeding, Animal Refresher. It has 5 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Genetics & Breeding to strengthen your preparation.
