Q.1
Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A) : Concept of Heritability is that it measures how much of the variation in a trait is attributed to its genetic factors
in a population
Reason (R) : Heritability is specific to the population and the environment to in which it is analysed
In light of the above statements, choose the most appropriate answer from the options given below.
- Assertion (A) is Correct: Heritability ($h^2$) in quantitative genetics is the proportion of total phenotypic variation ($V_P$) in a population that is attributable to genetic variation ($V_G$ in the broad sense, or additive genetic variance $V_A$ in the narrow sense):
- Reason (R) is Correct: Heritability is not a biological constant of an individual or species; it is a population-specific parameter that depends strictly on the genetic background of the specific population and the specific environmental variance ($V_E$) under which the animals are managed:
Changes in environmental control or allele frequencies directly alter $h^2$.
- Explanation: (R) correctly explains why heritability estimates vary across herds, seasons, and management systems.
Explanation not matching this question?
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