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MORE GENETICS PROBLEMS Huntingtons disease is a dominant allele (not sex-linked) that usually does not manifest itself until after age thirty-five. Individuals who have the disease are almost always heterozygous. As a genetics counselor, you are visited by a 23-year- old woman. Her mother has Huntingtons, but her father is normal. What is the probability that this woman will develop Huntingtons disease as she grows older? Draw a Punnett square. 1.

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Mother Hh hh father H h ti ti Hh (Huntington disease) hh

As we can see from the punnet square that the chance of woman to develop Huntington disease is 1/2 or 50%

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