Without using mathematical symbols, please explain the difference between the broad- and narrow-sense heritability and why one is more relevant to evolutionary studies
What will be an ideal response?
ANS:
The broad-sense heritability describes the proportion of the total phenotypic variance described by the genetic variance. The narrow-sense heritability describes the pro-portion of the total phenotypic variance described by the additive genetic variance. The narrow-sense heritability is more valuable to evolutionary studies as it focuses strictly on the additive genetic variation, and it is the additive genetic variance on which natural selection operates. In contrast, the broad-sense heritability includes many variance components whose impact on the phenotype are context dependent. In this way, these variance components may not be exposed to the action of natural selection.
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