Problem: Suppose that phenotypic variation in the tail length of mice is summarized in the table below.What is the narrow-sense heritability (h2) of tail length? What is the broad-sense heritability (H2) of tail length?

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Broad Sense Heritability: estimates percentage of genetic variance using all components of genetic variance

: ratio of genotypic variance to phenotypic variance

Narrow Sense Heritability: estimates percentage of genetic variance using only additive variance

: ratio of additive genotypic variance to phenotypic variance


Variance Components of a Quantitative Trait:

VP = VG + VE + VGE


where: VP = phenotypic variance
VG = genetic variation
VE = environmental variation
VGE = variation associated with the genetic and environmental factor interactions

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Problem Details

Suppose that phenotypic variation in the tail length of mice is summarized in the table below.



What is the narrow-sense heritability (h2) of tail length? 

What is the broad-sense heritability (H2) of tail length?

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