Principles of Genetics and Breeding

11.1.11 Genotypic value

Genotype is the particular assemblage of genes possessed by an individual.

• Genotypic value is attributable to the influence of the genotype. The genotype of the individual confers certain value to the individual, which is called the genotypic value. In principle, it is not, except when we are concerned with a single or a few loci where the genotypes are distinguishable.
• Considering one locus with two alleles, A₁ and A₂ there will be 3 genotypes.
• The genotypic value of A₁A₁, A₁A_2, A₂A₂ are a, d and -a, respectively. It is the convention that A₁ genotype has the highest and A₂A₂ has the lowest value.