Question

The possible genotypes of offsprings produced from a cross between a plant with a genotype of PP (purple flowers) and a plant with a genotype of pp (white flowers) is

• A. 100% are pp
• B. 100% are Pp
• C. 100% are PP
• D. 50% are PP and 50% are pp
• E. 25% are PP, 50% are Pp and 25% are pp

Answer 1

The correct option is B 100% are Pp

A cross between pure breeding dominant and recessive parents obtains all heterozygous dominant offspring. In the given cross, the allele for purple flower "P" is dominant over the allele for while flower "p". So, the cross between PP (purple flowers) and pp (white flowers) plants will obtain all plants with purple progeny (Pp). To get "pp" progeny, both parents should carry at least one copy of "p" allele. Thus, the correct answer is option B.