One parent who is normal and one parent who is a carrier of sickle-cell anemia have a child. Construct a Punnett square and find the probability that the child is normal A person with two sickle-cell genes will have the disease , a person with only one sickle-cell gene will be a carrier of the disease, and a person with no sickle-cell genes will be normal. Denote the sickle-gene by s and the normal gene by n. Use lowercase letters to indicate that s nor n is dominant