Lecture 8

is a measure of the relative variability of given populations

CV = (σ/µ) x 100

• Heritability is the proportion of the observed variation in a progeny that is inherited
• If genetic variation in a progeny is large in relation to the environmental variation, the heritability will be high
• In other words, the trait is highly controlled by genetic factors and less by environmental factors

• are based on partitioning the observed variance of a quantitative trait into genetically and environmentally controlled components
• H = (VP - VE) / VP

Phenotypic differences among individuals of the same genotype (Ve) caused by: Soil factors, Pest factors and climate factors

(H) is estimated from the total genetic variance, without taking into consideration the components of genetic variance.

(h2)—takes into account the genetic variance components.

• Determine relative importance of genetic effects (parent to offspring)
• Determination of selection method
• Predict gain from selection

Expected gain in the mean of a population for a quantitative character by one generation of selection of a specified % of the desired individuals