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What is the Coefficient of Variation?
is a measure of the relative variability of given populations
CV = (σ/µ) x 100
What is Heritability?
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
How is Heritability estimated?
are based on partitioning the observed variance of a quantitative trait into genetically and environmentally controlled components
H = (VP - VE) / VP
What is environmental variance?
Phenotypic differences among individuals of the same genotype (Ve) caused by: Soil factors, Pest factors and climate factors
Broad sense Heritability definition:
(H) is estimated from the total genetic variance, without taking into consideration the components of genetic variance.
Narrow sense Heritability definition:
(h2)—takes into account the genetic variance components.
Why use heritability estimates?
Determine relative importance of genetic effects (parent to offspring)
Determination of selection method
Predict gain from selection
What is genetic gain?
Expected gain in the mean of a population for a quantitative character by one generation of selection of a specified % of the desired individuals