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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