Background Paragraph: Another example of incomplete dominance is with sickle cell anemia, a disease in which a blood protein called hemoglobin is produced incorrectly. This causes the red blood cells to have a sickle shape, making it difficult for these misshapen cells to pass through the smallest blood vessels. A person that is homozygous recessive ( ss ) for the sickle cell trait will have red blood cells that all have the incorrect hemoglobin. A person who is homozygous dominant ( SS ) will have normal red blood cells. 
Story: Doctors studied  the blood of 2 sisters, Ann and Julie. Ann had sickle cell anemia, Julie did not.
Which sister had fewer cells that had a difficulty passing through the smallest blood vessels? Which sister had fewer cells that had a sickle shape? Which sister had less hemoglobin that was produced incorrectly? Which sister had more cells that had a difficulty passing through the smallest blood vessels? Which sister had more cells that had a sickle shape? Which sister had more hemoglobin that was produced incorrectly? Which sister was homozygous dominant ( SS ) for the sickle cell trait? Which sister was homozygous recessive ( ss ) for the sickle cell trait? Which sister was not homozygous dominant ( SS ) for the sickle cell trait? Which sister was not homozygous recessive ( ss ) for the sickle cell trait?