Explain three ways someone can manifest an autosomal, Ask an Expert

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The son of a man who does not have Huntington's develops Huntington's after age 50. His son develops Huntington's in his late thirties. describe (1) three ways someone can manifest an autosomal dominant phenotype when his father didn't have it, and (2) why this man's own offspring would show symptoms so much earlier than his father.

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