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20 November, 01:24

If you took dna samples from two strangers on a street, how similar would their dna be?

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  1. 20 November, 03:20
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    99.9% the same
  2. 20 November, 03:24
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    The correct answer is: about 99%.

    The main difference between two random people's genetic make-up issingle base pair differences, or polymorphisms (SNPs). There are about one SNP per 1000 bases. Since the human genome is about 3 Gbp long, about 3 million SNPs among two random people is present. SNPs may occur within coding sequences of genes, non-coding regions of genes, or in the intergenic regions.
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