Genetics of dairy production

1. If the phenotype of each trait is determined separately by allelic genes and the genes determining one trait are independant of the genes for the other trait, then we speak of independant loci.

Let's go back to the examples of the polled gene and the Shorthorn coat gene.

Now, we mate a bull homozygous with two horned alleles (pp) but heterozygous for the roan color coat (RW) with a cow heterozygous for the polled gene (Pp) and heterozygous for the roan color coat (RW).