1. In a strain of pigs that is true-breeding at all loci affecting the thickness

Question

1. In a strain of pigs that is true-breeding at all loci affecting the thickness of back fat, the variance in back fat thickness is 12mm2. What is the additive genetic variance and the environmental variance for back fat thickness in this population?

2. A tomato breeder starts with a population of tomato plants where mean fruit weight is 66 g. She selects the top 10% of tomato plants for fruit weight and calculates that the mean fruit weight among the selected plants is 90g. She then breeds only the selected plants together and observes that the mean fruit weight in the next generation is 72 g. What is the narrow-sense heritability for fruit weight in this population of tomato plants?

Explanation / Answer

1. In a strain of pigs that is true-breeding at all loci affecting the thickness of back fat, the variance in back fat thickness is 12mm2. What is the additive genetic variance and the environmental variance for back fat thickness in this population?

Answer:-

The equation for total phenotypic variation is

VP = VG + VE + VGE

Where VP is total phenotypic variation that is 12 mm2

VG is total genetic variance. Genetic variance includes additive genetic variance (VA), dominance genetic variance (VD) and interaction genetic variance (VI).

So VG =VA + VD + VI

VGE is the variation due to interaction between genetic and environ factors.

So here equation reduces to

VP =  VE = 12 mm2

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