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genes
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how many genes do humans have?
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"Only one-tenth of a single percent of DNA (about 3 million bases) differs from one person to the next. Scientists can use these variable regions to generate a DNA profile of an individual, using samples from blood, bone, hair, and other body tissues and products."
From this I'd say about 3,000,000,000 pairs of bases. Incidentally, a DNA strand stretched out is approximately 6ft long. DNA is in every cell in the body which has a nucleus, which is pretty amazing...
Okay so I've just found another site which suggests that there are a lot less.
http://www.cnn.com/2004/TECH/science/10/20/how.many.genes.ap /index.html?1