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Archive for December, 2010

Heritability / Repeatability of a trait

Good performing plants are selected and are expected to generate good performing progenies. The problem is that this selection is based on the phenotype which is influenced by the genotype, the environment and the measurement error. The ratio between phenotypic to genotypic effects is very important to have as information about the trait. the larger [...]

December 23rd, 2010
Topic: Crop Science, Plant breeding Tags: None

Response to selection and selection efficiency

The genetic advance achieved through selection depends on the total variation, the repeatability of the trait (h²) and the selection pressure imposed. The selection pressure implies the proportion of the population selected. Even if the repeatability is high the genetic advance (genetic gain) would be small without a large genetic variation. With selection the genetic variation [...]

December 12th, 2010
Topic: Crop Science, Plant breeding Tags: None