Friday, November 21, 2008

Punnett Square

A Punnett square is a chart that shows all possible combinations of alleles that can result from a genetic cross. The possible alleles from one parent are written across the top and the possible alleles from the other parent are written down the left side. The combined alleles in the boxes of the Punnett squre represent all the possible combinations in the offspring. Ina genetic cross, the allele that each parent will pass on to its offspring is based on probablility.