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Chance Mating or Panmixis
Just as the gene frequency is controlled in the genetic laboratory, so is the mating pattern, generation after generation. But outside the laboratory, mating is a chance or random affair. Every member of Mendelian population thus, depends on chance or random matings. In other words, every male gamete in the gene pool has an equal opportunity of uniting with every female gamete. Zygotic frequencies expected in the next generation from such random gametic unions may be predicted from a knowledge of the gene (allelic) frequencies in the gene pool of the parental population. For example, the expected zygotic frequencies for allele A and a of a gene pool can be determined by chance mating or panmixis. If p stands for percentage of A alleles in the gene pool and q stands for the percentage of a alleles, the checkerboard of both alleles, may predict possible chance combinations of A and a gametes as follows: