Question

P (purple) and p (white) are the dominant and recessive alleles for flower color in peas. Similarly, A (axial) and a (terminal) are the dominant and recessive alleles for flower position in peas. Two plants with the genotype PpAa are crossed. Which genotype is indicative of white axial flowers?

Answer 1

A: PpAa is indicative of white axial flowers
B: PPAA is indicative of white axial flowers
C: ppAa is indicative of white axial flowers

Answer 2

Well, since white flowers are recessive, the "goal" plant must have two small p's. Since axial positioning is the dominant trait, we could be looking for either AA or Aa, both of which produce axial flowers.

Looking at the answers:

A) PpAa --- With a P and an A, both dominant traits will be expressed, leading to a purple axial plant
B)PPAA --- With multiple P's and A's, both dominant traits will be expressed here as well.
C)ppAa --- Since this plant has two p's it will be white, but with at least one A it will still be axial and thus is the correct answer.

Answer 3

Thank You! :D