The number of eggs laid by female frogs in a highly inbred population is compare

Question

The number of eggs laid by female frogs in a highly inbred population is compared to the number of eggs laid by female frogs in the wild population from which the inbred population was established. The mean and standard deviation for eggs laid by the inbred population are 78 and 7, respectively, while these values for the wild population are 82 and 18, respectively.

A) What is the broad-sense heritability for this egg-laying trait?

B) What does this value indicate about the relative contribution of genetic and environmental variance to this trait?

Explanation / Answer

Variance = (standard deviation)^2

Variance of eggs = 7^2 = 49

Variance of wild population = 18^2 = 324

H^2 = Var(Eggs) / Var(Eggs + Wild)

H^2 = 49 / ( 324 + 49)

H^2 = 0.131

Broad sense Heritability = 0.131

This value indicate about the relative contribution of genetic and environmental variance to this trait that the genetic contributions to the phenotypic variance is additive and the individuals are directly affected by their parents . Also the trait is dominant in nature.

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