WEEK-8-Selection and Correlated Responses to Selection
Selection is often used to improve quantitative or production traits.
Heritability; one of the keys to selection is heritability. There are two types of heritability:
broad sense and narrow sense.
•Broad-sense heritability is the total genetic variation divided by total phenotypic variation.
•Narrow-sense heritability is defined as the additive genetic variation divided by the total phenotypic variation. It is the more useful of the two.
Heritability can range from 0.0 to 1.0 because there is the extremely rare possibility that all of phenotypic variation is due to additive genetic variation.
Heritability can be used as a predictor. In general, when heritability is less than 0.15, it is considered a low heritability.
Heritability between 0.15 and 0.3 would be considered a moderate heritability.
If heritability is 0.35 or higher, it is a high heritability.
