Question

You determine broad-sense heritability for quantitative trait and find a very low H^2 value. This could be caused by:

Question options:

	a). Having a huge number of loci controlling the trait, with variants in each locus having very little (quantitative) contribution to that trait.
	b). Genotypic variation having a major effect on gene-gene interactions
	c). Having a significant level of narrow-sense heritability, which is not represented within the broad-sense Heritability
	d) The increased difficulty in detecting broad-sense heritability for continuous characteristic traits than for discontinuous characteristic traits.
	e). The possibility of environmental variation having a very strong effect on determining the trait phenotype.

Answer 1

Answer :) Option e

The broad-sense heritability is measured by calculating VG/VP. In this, VG is the genetic variance while Vp is the phenotypic variance. Therefore, if the phenotypic variance were higher than the genetic variance, the broad-sense heritability would decrease. Therefore, option e is the correct answer.

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