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Which one of the following chromosomes has a mismatched pair in a normal human male ?

This questions was previously asked in

EPFO AO EO 2021

Chromosome number 21

Chromosome number 18

X-chromosome

Chromosome number 13

- In normal human males, chromosomes come in pairs, except for the sex chromosomes.

- Chromosome number 21, 18, and 13 are autosomes, and in normal males (and females), they exist as matched pairs (two copies of each).

- The X-chromosome in males is paired with a Y chromosome, not another X chromosome. This makes them a mismatched (XY) pair, unlike XX in females.

- Therefore, Option 3: X-chromosome is the chromosome with a mismatched pair in a normal human male.

Correct Answer: Option 3 - X-chromosome