Question

What phenotypic ratio would be expected in a cross between two pink snapdragon plants? There is incomplete dominance in snapdragons: RR is red; rr is white, and Rr ispinkal pink1 red 1 white1 red 1 pink1 red 2 pink 1 white000

Answer 1

Red-flowered snapdragon plants is a phenotypic trait given by a dominant allele (R), while white-flowered snapdragon plants is a phenotypic trait given by a recessive allele (r). Those snapdragon flowers with pink color, are then the result of a genotype of two different alleles, one dominant and one recessive, like Rr. So we have the following:

RR = red

Rr= pink

rr = white

Cross between two pink snapdragon plants:

Rr + Rr

So the expected phenotypic ratio would be the following:

So the answer to this question is 1 red, 2 pink, and 1 white.