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| Q. |
If the blood group of one parent is AB and that of the other 0, the possible blood group of their child would be - |
| A. | A or B |
| B. | A or B or O |
| C. | A or AB or O |
| D. | A or B or AB or O |
| Answer» A. A or B | |
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Explanation: Everyone has two copies of the gene for blood type (and for most other genes as well). Since O is a recessive trait that means that someone with type O blood must have two copies of the O gene. Types A and B are dominant, and since they're co-dominant, someone with type AB blood must have the A gene and the B gene. In reproduction, the offspring get one copy of each gene from each parent. Since the type O parent has two copies of the O gene, it's assured that the offspring will get one of them. |
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