Question

In pea plants, purple flowers (P) are dominant over white flowers (p). If two heterozygous purple-flowered plants are crossed with each other, then what are the possible genotypes of the offspring?

Answer 1

the answer is D

the reason why is because you have to do the punnet square

Answer 2

For this you would use a punnet square (ill try my best to show it while typing)
heterozygous means different, so with the purple flower youd get the gene shown as Pp and put it into the punnet square

     P     p
P  PP  Pp
p  Pp   pp

given the possibilities in the punnet square the genes with at least one P is going to be purple and the genes with 2 "p"s are going to be white

so you would have
25% Dominate Homozygous Purple
50% Dominate Heterozygous Purple
25% Recessive Homozygous White