How many autosomes and allosomes are present in human beings?

(21+2) pairs

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(22+1) pairs

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(19+4) pairs

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(2+21) pairs

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Solution

The correct option is B (22+1) pairs

There are 22 pairs of autosomes and one pair of allosomes (also called sex chromosomes), thus a total of 23 pairs of chromosomes.

In human karyotype, the autosome pairs are labelled with numbers, while the sex chromosomes are labelled with letters. Females (44+XX) have two X chromosomes while males (44+XY) contain one X and one Y chromosome.

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The number of pairs of autosomes and allosome in a human cell is __ and ___ .

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