Taylor's parents have never been tested for sickle cell disease because they have never had any of the co signs or symptoms. knowing that taylor has sickle cell disease, which of the following statements is true 1. both of taylor's parents carry the gene for scd. 2. taylor's mother carries the gene for scd and his father does not. 3. this disease trait skips generations and neither of his parents is a carrier for the scd gene 4. taylor's father carries the gene for scd and his mother does not.