Description of Quantitative Traits
Estimating Offspring Phenotype
If we have determined the narrow sense heritability of a trait and know several population values we can estimate the phenotypic value for an offspring. The following formula can be used for the prediction.
To = T + h2(T*-T) where
To = predicted offspring phenotype
Let's use the following information to estimate the offspring phenotype
T = 80 seeds/plant
To = 80 + 0.5 (105-80)
The conclusion that we can draw is not that each plant in the next generation will have 92.5 seeds/plant, but rather that on average the population derived from mating these two parents will have 92.5 seeds/plant. Remember that quantitative traits are affected by the environment, and the environment will be responsible for the deviations that we would see from the estimated phenotype.
Copyright © 1997,1999. Phillip McClean