Saturday, February 25, 2012

What is the percentage of difference between down syndrome dna and normal dna?

I'm aware there is an extra #21 chromosome. But what % difference does that amount to compared to the average person? As in "it is 1.2% different from your average person's dna".What is the percentage of difference between down syndrome dna and normal dna?
Im not sure on the exact figure, as it is number 21 and the chromosomes are ranked in order of size, it is a smaller chromosome. As we have 46 chromosomes, and extra would make up about 1-2% extra. Sorry i don't know the specifics. It may even vary a tiny bit between individuals, as mutations can occur a variety of ways.
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