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Who has a perfect pair of sex chromosomes?

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Girls only

Boys only

Both girls and boys

It depends on many other factors

answer is A.

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Detailed Solution

Men and women have mismatched pairs of sex chromosomes, with one being a normal-sized X and the other being a short Y, making up the letters XY.

The 23rd pair, also known as the allosome or sex chromosome, is what determines a person's sex.

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