Traits Most Affected by Inbreeding Depression
Which trait show greatest inbreeding depression-
- Carcass quality
- Reproductive trait, fitness trait
- Trait related to viability
- Both b & c — Correct Answer
Explanation:
Correct Answer: Both b & c
Inbreeding depression is the reduction in fitness and performance caused by increasing homozygosity. It most severely affects traits governed by non-additive gene action — primarily reproductive traits, fitness traits, and viability/survival traits.
Inbreeding Depression — Trait Susceptibility
| Trait Category | h² | Governed by | Inbreeding Depression |
|---|---|---|---|
| Reproductive traits (fertility, litter size, conception rate) | Low | Non-additive gene action | Greatest |
| Fitness/Viability traits (survival, immune competence) | Low | Non-additive gene action | Greatest |
| Production traits (milk yield, growth rate) | Medium | Mixed | Moderate |
| Carcass quality, fat%, fleece weight | High | Additive gene action | Least / Minimal |
The Heritability–Inbreeding Depression Relationship
- Inbreeding depression is inversely related to h²
- High heterosis ↔ low h² ↔ high inbreeding depression (all three go together)
- This is why crossbreeding most benefits reproductive and fitness traits
📚 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.
