Well, if you use a punnent square, all you would have to do is put Aa on the top and AA on the bottom. A a a Aa AA a Aa AA So as you can see there is a 50 % chance the off spring will be Aa and a 50%...
The genotypes of this cross are: AA - 25% Aa - 50% aa - 25%The phenotypes of this cross are: Dominant trait (A) - 75% Recessive trait (a) - 25% A ratio of dominant to recessive phenotypes - 3:1