False teeth help the digestive system by chewing pieces of food into smaller pieces but it is not part of it.
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This reaction occurs in the thylakoids of the chloroplast
This would be probably true if the assumption that all possible genotypic variations would be equally distributed (so we would have 25% HH, 25% hh and 2x 25 Hh). If this distribution would be true and Huntingtons disease really was a single gene dominant trait diesase, then yes, we could expect such a distribution in the population.