Which of the Following is a Component of Narrow Sense

Question

Which of the following is a component of narrow sense heritability?
A) Additive effects of alleles
B) Dominance interactions among alleles
C) Environmental effects
D) Epistatic relationships among alleles
E) All of these

Accepted Answer

Narrow sense heritability specifically refers to the fraction of total phenotypic variance that can be attributed to additive genetic factors. Therefore, only the additive effects of alleles are a component of narrow sense heritability. Dominance interactions, environmental effects, and epistatic relationships are not considered in narrow sense heritability.