Question

In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F2 generation of the cross RRYY x rryy?

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

Answer 1

Answer: (D)

Round seeds with yellow cotyledons and wrinkled seeds with yellow cotyledons

Answer 2

In Mendel's experiments with garden peas, the expected phenotypes in the F2 generation of the cross RRYY x rryy would follow the principle of independent assortment. So, the expected phenotypes in the F2 generation would be Round seeds with yellow cotyledons and wrinkled seeds with yellow cotyledons. This is because the two traits, seed shape (round or wrinkled) and cotyledon color (yellow or green), are on different gene loci and independently assort during meiosis.

So, the correct option is (D): Round seeds with yellow cotyledons and wrinkled seeds with yellow cotyledons