Term for Ratio of Selection Differential to Phenotypic SD
The ratio of selection differential to the phenotypic standard deviation of a trait is known as:
- Intensity of selection — Correct Answer
- Response to selection
- Accuracy of selection
- Limit of selection
Explanation:
Correct Answer: Intensity of selection
Intensity of selection (i) = S / σp, where S is the selection differential and σp is the phenotypic standard deviation.
Key Formulae Related to Selection
- Response to selection (R) = h² × S = i × h² × σp = i × σA × rAP
- Selection differential (S) = i × σp
- Realized heritability = R / S (ratio of response to selection differential)
Factors Affecting Intensity of Selection
- Proportion of population selected (fewer selected → higher intensity)
- Phenotypic standard deviation (σp)
- Sex of animal under selection
- Number of traits under selection
- Accurate measurement of the trait
📚 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.
