How many genes make up the human genome? four: adenine, thymine, guanine, and cytosine 23 pairs of genes 20,000–25,000 genes 3 billion genes
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The human genome has 23 chromosome pairs with a total of about 3 billion DNA base pairs. There are 22 autosomal chromosomes plus the sex determining X and Y chromosomes, to make 23 pairs.
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