Definition of Punnett Square

A Punnett square is a sort of graph that represents all the possible genotypes of the offspring that arose from a particular breeding event. In order to form a Punnett square, the genetic combination of the parental generation must be known. The possible genotypes are exhibited in the form of a table and each box of the table depicts a fertilization event.

This is commonly used nowadays to explain the results that were obtained by Mendel and they are then combined with the current knowledge of genetic material (DNA, genes, and chromosomes). The monohybrid as well as dihybrid cross can be exhibited by the Punnett square.

The above picture is of a Punnett square which depicts a typical test cross. The green pod in the pea plant is dominant over the yellow pod.