A man of blood type A married a woman of blood type B, they had a child of type AB. What does this mean in terms of genetics?
1
The gene is dominant for blood group A and the gene is recessive for blood group B.
2
The gene for blood group B is dominant and the gene for blood group A is recessive.
3
The gene for blood type A and the gene for blood type B are both inactive.
4
Both the gene for blood type A and the gene for blood type B are dominant.