suppose that a disease is inherited via the dominant mode of inheritance and that only one of the two parents is affected. the implication of this mode of inheritance is that the probability is half that any particular offspring will get the disease. what is the probability that in a family of two children ;1. both siblings are affected 2. the younger child is affected given that the older one is affected 3. exactly 1 child is affected and lastly 4. neither sibling is affected