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In human beings there are only 23 pairs ...

In human beings there are only 23 pairs of chromosomes but there are unlimited characteristic feautres. Justify.

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Chromosomes are made up of genes, which in turn are made up of DNA. Stretches of DNA code for a polypeptide ie, such stretches make a gene. Hence on each chromosome, there may be variable number of genes present which control unlimited number of features.
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