Question

An allele for red flower color (R) is dominant to an allele for white flower color (r). Heterozygotes for red exhibit 50% penetrance. The following cross is carried out: Rr x rr. What proportion of the progeny will be red?

a)1
b)0.5
c)0.125
d)0.25
e)0

Answer 1

The phenotypic ratio of the progeny in the given cross is 1:1.

Step-by-step explanation:

The cross between an individual with the genotype Rr (heterozygous for red flower color) and an individual with the genotype rr (homozygous for white flower color) will result in a phenotypic ratio of 1:1 for red flowers and white flowers. This means that 50% of the progeny will be red.