Basis of Estimation using Resemblance Between Relatives
"Resemblance between relatives" is the basis of estimation of:
- Heritability — Correct Answer
- Repeatability
- Genetic Correlation
- Both a & c
Explanation:
Correct Answer: Heritability
The concept of "resemblance between relatives" is the basis of estimation of Heritability (h²). The degree to which relatives resemble each other in phenotype reflects the additive genetic variance, from which heritability is derived.
Covariance of Relatives (Basis for Heritability Estimation)
| Relatives | Covariance | Heritability Formula |
|---|---|---|
| Offspring & one parent | ½ VA | h² = 2b (b = regression) |
| Offspring & mid-parent | ½ VA | h² = b |
| Half-sibs | ¼ VA | h² = 4t (t = intraclass correlation) |
| Full-sibs | ½ VA + ¼ VD + VEC | h² = 2t |
Example Calculation
- If correlation coefficient of half-sibs = 0.2, then h² = 4 × 0.2 = 0.8
Why Other Options Are Wrong
- Repeatability uses successive records of same individual, not between relatives.
- Genetic correlation uses covariance of two different traits between relatives.
📚 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.
