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There are some seriously inaccurate statements in the article.

"The clues are not genes, but mutations that are found in higher frequency in some groups than in others. These mutations largely occur in parts of the DNA with no specific function, but they can lead to diseases such as Tay-Sachs or dysautonomia."

If a mutation occurs (as some do) in a part of DNA that has no obvious function, then it cannot cause disease.

Mutations are the result of two genetic phenomena known as founder effect and bottleneck effect.

Mutations are caused by inexact copying of DNA during the reproductive process. They are not a result of the founder or bottleneck effects. When a population goes through a bottleneck - a period in which very few individuals survive and later become ancestors of a large group, then any mutations carried through the bottleneck tend to be found widely in the ensuing population.

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