How are the cause and onset of symtoms of Huntington's disease different from those of PKU and Tay-Sachs disease?

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Huntington's disease is a neurodegenerative disorder and its symptoms  are adult onset and begin to appear between the mid-thirties to mid-forties. It is an autosomal dominant gene that produces this disease. This means that if an individual inherits only one mutant allele from one parent and the other allele is normal, the person will develop Huntington's disease. The mutant allele produce an abnormal version of the protein Huntingtin which begins to damage areas of the brain. Tay Sachs disease...

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