Genotype describes the genetic constitution of an individual, that is the specific allelic makeup of an individual, usually with reference to a specific character under consideration 1. For instance, there are three possible genotypes for the human albino gene, and it has two allelic forms, dominant A and recessive a. Thus the three possible genotypes are AA (homozygous dominant), Aa (heterozygous), and aa (homozygous recessive).
Brittany has AA genotype for blond hair.
by Mary Lee December 17, 2007