Associate Professor Dept of Genetics and Animal Breeding PSTU Barishal campus Overview Definition Scale of Heritability Example Uses of Heritability Limitations of Heritability Methods of Estimation of Heritability ID: 1009259
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1. HeritabilityDr. Ripon Chandra PaulAssociate ProfessorDept. of Genetics and Animal BreedingPSTU, Barishal campus
2. Overview Definition Scale of Heritability Example Uses of Heritability Limitations of Heritability Methods of Estimation of Heritability
3. Heritability In genetics, heritability is the proportion of phenotypic variation in a population that is attributable to genetic variation among individuals. Variation among individuals may be due to genetic and/ or environmental factors.
4. Scale of heritabilityLow heritability ranges from: 0-0.11Medium heritability ranges from: 0.12-0.30High heritability ranges from: 0.31-1.0
5. Example
6. Uses of Heritability It is useful in predicting the effectiveness of selection. It is also helpful for deciding breeding methods to be followed, for effective selection. It gives an idea about the response of various characters to selection pressure. It is useful in predicting the performance under different degree of intensity of selection. It helps for construction of selection index. Estimates of heritability serve as a useful guide to the breeder, to appreciate the proportion of variation, which is due to genotypic or additive effects.
7. Limitations of heritability Heritability does not indicate the degree to which a characteristic is genetically determined. An individual does not have heritability. There is no universal heritability for a characteristic. Even when heritability is high, environmental factors may influence a characteristic.
8. Estimation of HeritabilityThe main basis of estimating heritability of a trait is the degree of resemblance between relatives that depends upon the degree to which relative’s have- Genes in common Genotype in common Environment in common Methods Parent-offspring regression method Sib analysis or half/ full sib correlation Using twin information or twin analysis Results of selection experiment The knowledge of repeatability estimate Restricted Maximum Likelihood (REML) approach Markov Chain Monte Carlo (MCMC) simulation approach.