According to the law of segregation, in an organism with the genotype Aa

A) all of the gametes get the A allele.
B) three- quarters of the gametes get the A allele and one- quarter get the a allele.
C) all of the gametes get the a allele.
D) one- quarter of the gametes get the A allele and three- quarters get the a allele.
E) one- half of the gametes get the A allele and one- half get the a allele.