A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits – blood group A or O – is dominant? Why or why not?

Explanation

To determine whether the blood group A or O is dominant based on the given information, we can follow these steps:

### Step 1: Understand Blood Group Genetics
Blood groups in humans are determined by the I gene, which has three alleles: IA (for blood group A), IB (for blood group B), and IO (for blood group O). The alleles IA and IB are dominant over IO, which is recessive.

### Step 2: Analyze the Parents' Blood Groups
- The man has blood group A. His genotype could either be:
- Homozygous dominant: IAIA
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