Question

Assertion (A): Linked genes do not show dihybrid F₂ ratio 9 : 3 : 3 : 1.

Reason (R): Linked genes do not undergo independent assortment.

Options

• Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).

• Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).

• Assertion (A) is true, but Reason (R) is false.

• Assertion (A) is false, but Reason (R) is true.

Answer 1

Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).

Explanation:

• Assertion A is true.
  Because this ratio is expected when genes assort independently (i.e., are unlinked).
• Reason R is true.
  Linked genes are located close together on the same chromosome and are usually inherited together.