Zoology - Principles of Inheritance and Variation Question with Solution | TestHub

In the given question, the cross is between YYRRII and yyrrii. The${\mathrm{F}}_1$hybrid is YyRrIi.

For getting, the${\mathrm{F}}_2$generation the cross is YyRrIi x YyRrIi. It is a pea plant where all characters are independent assorted so we can consider the crosses separately:

In$\mathrm{Y}\mathrm{y}\mathrm{ }\mathrm{x}\mathrm{ }\mathrm{Y}\mathrm{y}$, the proportion of yellow seeds produced is$\frac{3}{4}$and the proportion of green seeds produced is$\frac{1}{4}$

In$\mathrm{R}\mathrm{r}\mathrm{ }\mathrm{x}\mathrm{ }\mathrm{R}\mathrm{r}$, the proportion of round seeds produced is$\frac{3}{4}$and the proportion of wrinkled seeds produced is$\frac{1}{4}$

In Ii x Ii, the proportion of inflated pods produced is$\frac{3}{4}$and the proportion of constricted pods produced is$\frac{1}{4}$

Thus the proportion of plants having green round seeds in an inflated pod in the${\mathrm{F}}_2$generation is$\frac{1}{4}\times \frac{3}{4}\times \frac{3}{4} =\frac{9}{64}$