Question

Assertion (A): In dihybrid crosses involving sex-linked genes in Drosophila generation of non-parental gene combinations are observed.
Reason (R): Two genes present on different chromosomes show linkage and recombination in Drosophila.

• A. Both (A) and (R) are true and (R) is the correct explanation of (A).
• B. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
• C. (A) is true, but (R) is false.
• D. (A) is false, but (R) is true.

Hint:

Linkage is only between genes on the same chromosome — not different ones.

Answer 1

The Correct Option is C

In Drosophila, non-parental gene combinations can arise due to recombination involving sex-linked genes. However, the Reason is incorrect because genes on different chromosomes do not show linkage; linkage occurs between genes on the same chromosome.