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Huntingtons Chorea: Evolution and Genetic Disease (2 of 3)
If a mutation ends up inserting extra CAGs into the Huntingtons gene, new Huntingtons alleles may be created. Of course its also possible for a mutation to remove CAGs. But research suggests that for Huntingtons, mutation is biased; additions of CAGs are more likely than losses of CAGs.
Read more on the genetics of Huntingtons Disease at Stanford Universitys HOPES site.
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Spanish translation of Understanding Evolution For Teachers from the Spanish Society of Evolutionary Biology.