Question

Assertion (A): A pair of genes is said to be linked if their recombination frequency is 50% or lower.

Reason (R): Higher frequency of crossing over is shown in linked genes if distance between them is longer.

Options

• Both assertion (A) and reason (R) are true, and reason is the correct explanation of assertion.

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

• Assertion (A) is true but reason (R) is false.

• Both assertion (A) and reason (R) are false.

Answer 1

Both assertion (A) and reason (R) are true, but reason is not the correct explanation of assertion.

Explanation:

Both statements express the textbook description: linked genes show recombination at or below the 50% limit, and crossing over increases as the distance between genes increases. The reason describes crossing-over frequency but does not itself define linkage.