The Punnett square is
a diagram that is used to predict an outcome of a particular cross or breeding
experiment. It is named after Reginald C. Punnett, who devised the approach.
The diagram is used by biologists to determine the probability of an
offspring's having a particular genotype. The Punnett square is a tabular
summary of every possible combination of one maternal allele with one paternal
allele for each gene being studied in the cross. These tables give the correct
probabilities for the genotype outcomes of independent crosses where the
probability of inheriting copies of each parental allele is independent. The
Punnett Square is a visual representation of Mendelian inheritance.