Huntington's Disease is caused by an autosomal dominant allele (H). The disease begins to manifest itself early in middle age, often after the individual has already produced children. Suppose a woman who has no history of Huntington's disease in her family marries a man whose father died of Huntington's disease but whose mother is disease free. They produce a child. However by the time the child is 18, the father has begun to show early signs of Huntington's. What is the probability that their child will be stricken with the disease? show the probability with a punnett square.