Calculating Narrow Sense Heritability
If $V_{A}=20$, $V_{G}=30$ & $V_{P}=100$ then heritability in narrow sense will be
- 0.20 — Correct Answer
- 0.30
- 0.50
- None
Explanation:
Correct Answer: 0.20
Heritability in narrow sense (h²ɴ) = VA / VP = 20 / 100 = 0.20
Derivation of All Values
| Parameter | Formula | Value |
|---|---|---|
| h²ɴ (narrow sense) | VA / VP | 20/100 = 0.20 |
| H²ᴮ (broad sense) | VG / VP | 30/100 = 0.30 |
| VE (Environmental variance) | VP − VG | 100 − 30 = 70 |
| Non-additive variance (VD + VI) | VG − VA | 30 − 20 = 10 |
Key rule: h²ɴ ≤ H²ᴮ always (here 0.20 ≤ 0.30 ✓).
They are equal only when VD = 0 and VI = 0 (purely additive inheritance).
📚 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.
