Question

The possible genotypes of the offsprings produced as a result of a cross between a plant with genotype PP (purple flowers) and a plant with genotype pp (white flowers) would be

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

Answer 1

The correct option is B $100\%$ are Pp

Two pure-breeding parents produce a heterozygous dominant progeny. In the given question, a cross between pure breeding PP and pp will produce all progeny with Pp genotype. This is due to purity of gametes (production of gametes with "P" and "p" by PP and pp parent) and the random fusion of these gametes. Gametes by "PP" parent having "P" and those of "pp" parent having "p" will give all progeny having one "P" and one "p" allele.

Therefore, the correct answer is option B.