Question

In peas, yellow seed color (Y) is dominant to green seed color (y). A homozygous green pea plant is crossed with a heterozygous yellow pea plant. What is the predicted phenotypic ratio of the offspring

Answer 1

Each offspring will receive one allele from each parent, so the cross will be Yy with yy, resulting in four possible offspring: Yy, Yy, yy, and yy. Since Y is dominant to y, there will be two yellow for every four offspring or the ratio of 1/2 (Look up Punnet squares to understand this concept better)

Answer 2

2: 2 or 1:1

Step-by-step explanation:

It is given that the yellow seed color is dominant over green seed color. The genotype of homozygous green pea plant and heterozygous yellow pea plants are “yy” and “Yy” respectively.

The following punnet table represents the cross between “yy” and “Yy”

y y

Y Yy Yy

y yy yy

The genotypic ration is 2Yy :2yy

Yy represents heterozygous yellow pea plant

yy represents homozygous green pea plant

yellow pea plant : green pea plant is equal to 2: 2 or 1:1