Question

Write the phenotypic and genotypic ratios of Mendel's cross-pollination experiments in pea plants with heterozygous yellow seeds $\left(Y_y\right)$ with that of the same type, i.e., $Y_y$.

Answer 1

If the heterozygous yellow seeds Yy are crossed with heterozygous yellow seeds Yy,

Parents: Yy x Yy

Gametes: Y, y x Y, y

Offspring: YY, Yy, Yy and yy

YY (yellow), Yy (yellow), Yy (yellow) and yy (green)

From the Punnett square, the phenotypic ratio is 3 (yellow): 1 (green).

The genotypic ratio is 1: 2: 1 (YY- 1, Yy-2 and yy-1).