What is the expected ratio of genotypes in the F1 generation that grew from the cross in the first question (true breeding purple flowers x true breeding white flowers)?

Question

What is the expected ratio of genotypes in the F1 generation that grew from the cross in the first question (true breeding purple flowers x true breeding white flowers)?

A. all Pp (heterozygous)

B. 1 PP : 2 Pp : 1 pp

C. 3 P : 1 p

D. 1 PP : 1 Pp : 1 pP : 1 pp

Answer 1

A cross between 2 true breeding flowers should produce all Pp. The reason is that the true breeding plants will be either homozygous dominant PP or homozygous recessive pp. Therefore, all offspring will be Pp.