WAEC Biology 2005 Question 53

If two parents are sickle cell carriers then their genotypes would be

1. A.Hb^A Hb^A and Hb^S Hb^S
2. B.Hb^S Hb^S and Hb^S Hb^S
3. C.Hb^A Hb^S and Hb^A Hb^S
4. D.Hb^A Hb^A and Hb^A Hb^A