Narrow-sense heritability is defined as the ________ genetic variation divided by the ________ variation.
A) total; total phenotypic
B) additive; total phenotypic
C) dominance; total phenotypic
D) additive; total dominance

Question

Quizplus · Accepted Answer

Narrow-sense heritability (h²) is defined as the proportion of phenotypic variation in a trait that is due to additive genetic variation. Therefore, it is calculated by dividing the additive genetic variation by the total phenotypic variation. Option A is incorrect because total genetic variation includes both additive and non-additive genetic components. Option C is incorrect because dominance variation is a non-additive genetic component and is not used in calculating narrow-sense heritability. Option D is incorrect because dominance variation is not included in calculating narrow-sense heritability.

Narrow-Sense Heritability Is Defined as the ________ Genetic Variation Divided