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Gregor Mendel’s Law of segregation states that an organism must have 2 genetic factors called alleles for each trait. Furthermore, these alleles must separate during gamete formation in meiosis I, and then recombine at fertilization in a new genetic combination in the offspring. There are two types of alleles: dominant and recessive. In gamete formation, there is a possibility of three gene combinations depending of the genotypes (genetic makeup) of the parents. These combinations can consist of DD (homozygous dominant), Dd (heterozygous dominant), and dd (homozygous recessive). Each parent during gamete formation will donate one allele, which will form these examples of unlinked monohybrid genes. However offspring also inherit dihybrid genes, which are genes that contain four alleles that code for more than one trait (ex. TI, ti). Here too there are both dominant and recessive alleles. After Mendel performed dihybrid test crosses, he formulated the Law of Independent Asso