Question

Assertion (A): Round green seeds in pea can be represented by RRyy of Rryy.

Reason (R): Round yellow seeds and green wrinkled seeds are parental combinations whereas round green and wrinkled yellow are recombinants.

Options

• Both A and R are true and R is the correct explanation of A.

• Both A and R are true but R is not the correct explanation of A.

• A is true but R is false.

• A is false but R is true.

Answer 1

Both A and R are true but R is not the correct explanation of A.

Explanation:

The assertion is true because round (R) is dominant over wrinkled, and green (y) is a recessive trait; thus, both homozygous (RRyy) and heterozygous (Rryy) genotypes produce round green seeds. The reason is also true because in Mendel’s classic dihybrid cross, round yellow and wrinkled green are the initial parental phenotypes, while round green and wrinkled yellow are the new recombinant combinations. However, the reason is not the correct explanation because categorising the seed phenotypes as parental or recombinant does not account for the specific genetic dominance or allelic combinations that dictate the genotypes in the assertion.