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B
Polydactyly
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C
Huntington's chorea
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D
Phenylketonuria
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Solution
The correct option is B Huntington's chorea
Huntington's disease is a progressive brain disorder caused by a single defective gene on chromosome 4 — one of the 23 human chromosomes that carry a person’s entire genetic code. This defect is "dominant," meaning that anyone who inherits it from a parent with Huntington's will eventually develop the disease. Symptoms of Huntington's disease usually develop between ages 30 and 50.