Question

In Mendel's experiments with Garden Pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledons (YY) was dominant over green cotyledons (yy). What are expected phenotypes in $F_2$ generation RRYY $\times$ rryy?

• A. Only wrinkled seeds with green cotyledons
• B. Only wrinkled seeds with yellow cotyledons
• C. Only round seeds with green cotyledons
• D. Round seeds with yellow cotyledons and wrinkled seeds with green cotyledons

Answer 1

The correct option is D Round seeds with yellow cotyledons and wrinkled seeds with green cotyledons

In Mendel’s dihybrid cross, cross is made between homozygous yellow round seeds(YYRR) to another homozygous green wrinkled seeds(yyrr). In the F₁ generation, all plants are heterozygous yellow round(YyrRr). When this plant is subjected to self pollination, in the F₂ generation, 9 plants are Yellow round, 3 plants are yellow wrinkled, 3 plants are green round and 1 plant is green wrinkled are formed.

So, the correct option is ‘Round seeds with yellow cotyledons and wrinkled seeds with green cotyledons’.