Question

If there are two alleles at a locus, and there is incomplete dominance - the phenotypic values of AA, Aa and aa are 1, 0.5, and 0 - do the alleles contribute to narrow sense or broad sense heritability?

	A.	Broad sense, since (AA) and (Aa) individuals will have the same phenotypic trait value.
	B.	Narrow sense, since (AA) and (Aa) individuals will have different phenotypic trait values.
	C.	Both broad sense heritability and narrow sense heritability.
	D.	Narrow sense, since (AA) and (Aa) individuals will have the same phenotypic trait values.
	E.	Broad sense, since (AA) and (Aa) individuals will have different phenotypic trait values.

Answer 1

Ans)

C.	Both broad sense heritability and narrow sense heritability.

Explaination: narrow sense heritability is the measure of phenotypic variation portion due to additive effect of alleles so here each dominant gene ie B contribute 0.5 so both BB and Bb have different phenotypic trait value.

It also contribute to broad sense heritability which is total genotypic variance portion in phenotypic variation

VG=total genotypic variation=Va +Vi+Vd

Where Va is additive allele effect.

So these phenotypic value variation contribute to both broad sense and narrow sense heritability.