Correlation Indicated by High Heritability
High heritability indicates high correlation between-
- Genotype & Environment
- Phenotype & Genotype — Correct Answer
- Phenotype & Environment
- None of the above
Explanation:
Correct Answer: Phenotype & Genotype
Heritability in narrow sense (h²N) mathematically equals the squared correlation between breeding value (A) and phenotypic value (P): h²N = r²AP. Therefore, high heritability directly indicates a strong positive correlation between an animal's phenotype (what we observe) and its genotype/breeding value (what it actually is genetically).
Heritability — Key Mathematical Relationships
- h²N = VA / VP = bAP (regression of A on P) = r²AP
- High h² → high r between Phenotype and Genotype → phenotype is a reliable predictor of breeding value
- Low h² → low r → environment dominates phenotypic expression → phenotype is an unreliable predictor
Practical Meaning
| Correlation Type | Relation to h² |
|---|---|
| Phenotype & Genotype (rPG) | High h² = high rPG; the key relationship in selection accuracy |
| Genotype & Environment | Not directly related to h²; represents G×E interaction |
| Phenotype & Environment | High when h² is LOW (environment dominates) |
📚 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.
