What alleles would the offspring have if both parents are pure a or pure A?
If the parents are both AA, which results in the cross AA X AA,
then the offspring will all be AA. If both parents are AA,
resulting in the cross AA X AA, then all offspring will be AA. If
BOTH parents are Aa, resulting in the cross Aa X Aa, then the
offspring will be 25% AA, 50% Aa, and 25% AA. This is only true if
the alleles are not sex-linked.