Question

Assertion (A): Repetitive sequences make up a very large portion of the human genome.

Reason (R): Repetitive sequences do not have direct coding functions in the genome.

पर्याय

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

Explanation:

• The assertion is true: a very large fraction of the human genome is made of repetitive DNA (e.g., tandem repeats, transposable-element-derived repeats).
• Reason is largely true in the general sense: many repetitive elements do not directly code for proteins (for example, VNTRs and other noncoding repeats).
• However, the reason is not the correct explanation: repeats are abundant because of processes that amplify them (transposition, duplications, retrotransposition and genome rearrangements), not simply because they lack coding function; additionally, some repeats have regulatory roles or have been exapted into coding sequences.