Question

in pea plants, the trait for purple flowers (P) is dominant over the trait for white flowers (p). if two heterozygous purple plants are crossed, what percentage of the offspring would be expected to have the same phenotype as the parents?

a ) 75% (3/4)
b ) 25% (1/4)
c ) 100% (4/4)
d ) 50% (2/4)

Answer 1

The correct answer is a) 75% (3/4).

When two heterozygous purple plants (Pp) are crossed, they can produce four different genotypes: PP, Pp, Pp, and pp.

Among these four genotypes, three of them (PP, Pp, and Pp) would have the purple flower phenotype. Only one genotype (pp) would have the white flower phenotype.

Therefore, out of the four possible genotypes, 3/4 or 75% of the offspring would be expected to have the same phenotype as the parents (purple flowers).