In pea plants, purple flowers are dominant over white flowers, which are recessive. Cross two homozygous dominant (PP) parents.

A punnet square is a diagram which illustrates the results of a cross. The results from a cross between two homozygous dominant (PP) parents can be illustrated as follows:

P P

P PP PP

P PP PP

A dominant trait can be described as the one which suppresses the effect of a recessive trait.

The outcomes of this cross show that all of the offsprings produced will be homozygous dominant having purple colour.