Question

Find out the wrongly matched pair.

• A. Y-chromosome - 231 genes
• B. Chromosome-1 - 2968 genes
• C. Dystrophin - 2.4 million bases
• D. Human genome - 300 bases

Hint:

Remember: Human genome ≈ 3 billion base pairs (not 300!).

Answer 1

The Correct Option is D

Concept: The human genome consists of a very large number of base pairs and genes distributed across chromosomes.
Step 1: Evaluate each pair.

• Y-chromosome $\rightarrow$ About 200–300 genes (correct)
• Chromosome-1 $\rightarrow$ Largest chromosome with $\sim$2968 genes (correct)
• Dystrophin $\rightarrow$ One of the largest genes ($\sim$2.4 million base pairs) (correct)
• Human genome $\rightarrow$ Actually contains about $3 \times 10^9$ base pairs, not 300 (incorrect)

Step 2: Conclusion.
Thus, the wrongly matched pair is “Human genome - 300 bases”.