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A normal human body cell contains 23 pairs of chromosomes. How many of these pairs are autosomes?
A22 pairs
B21 pairs
C23 pairs
D20 pairs
Answer & Solution
Correct answer: A. 22 pairs
1. A human cell normally has 23 pairs of chromosomes in total.
2. Of these, one pair is the sex chromosome or allosome.
3. So the autosomes are 23 minus 1 = 22 pairs.
4. Therefore the number of autosome pairs is 22, option A.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 18 Genetics "Karyotype", p.273_
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