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 heterozygous plants are purple, therefore purple is the dominant allele. Assuming it is a single gene with only two possible alleles and the other colour is white; a cross between two heterozygous plants (Pp X Pp) should produce 3 purple and 1 white offspring. This means 3/4 will be purple. 1 offspring will have the genotype PP (purple), 2 will have Pp (purple) and 1 will have pp (white).