AGB 211: Livestock and Poultry Breeding (2+1)

BACK CROSSING

• It is the mating of a cross bred animal back to one of the pure parent races, which were used to produce it. It is commonly used in genetic studies, but not widely used by breeders. When one of the parents possess all or most of the recessive traits, the back cross permits a surer analysis of the genetic situation than the F₂ does.
• A heterozygous individual of F₁ when crossed with a homozygous recessive parent the offspring group themselves into a phenotypic ratio of 1:1. On the other hand if the F₁ individual is crossed with the homozygous dominant parent then all the offspring will be phenotypically alike.