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How many pairs of human chromosomes are not the sex chromosomes?

A22
B12
C42
D32
Answer & Solution
Correct answer: A. 22
1. Most human chromosomes have a maternal and a paternal copy. 2. There are 22 such pairs. 3. One further pair, the sex chromosomes, is not always a perfect pair. _Source: syllabus Science, Ch 9 'Heredity and Evolution'_
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