How do you estimate the narrow sense heritability based on the halfsib offspring of open pollinated trees?

Answer 1

First we need to calculate within and between family variance components for half sib families. Additive variance is equal to 4 time the additive variance and Dominance variance equal to within family variance - (3/4) additive variance.

Answer 2

Narrow sense heritability can be estimated by calculating the resemblance between half-sib offspring raised in a common environment. By measuring the similarity in traits among these offspring and accounting for the relatedness between them and their common parent, one can quantify the proportion of variation in the traits due to additive genetic factors. This provides an estimate of the narrow sense heritability of those traits.