4. juan’s family has a history of sickle cell disease. his father died of sickle cell disease complications when juan was six years old. he remembers his father being in great pain. juan marries gina. gina’s maternal grandmother and paternal grandfather had sickle cell disease, but neither of her parents has the disease. juan does not want to have children because he is convinced they will have sickle cell disease. gina is not so sure. they have come to you for advice about having whether or not to have children. based on your calculations of the probability of their child getting sickle cell disease, what is your advice? show your calculations and explain your reasoning for your response. it may be for you to draw pedigrees and possible punnett squares for both juan’s and gina’s families.