A man with blood group A marries a woman with blood group O

3. 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?

Answer: Here, we see that a blood group type of father is AO. Here allele A expresses itself while allele O remains silent. This expression means that allele type A show dominance over allele O.

Next: 4. How is the sex of the child determined in human beings?

See also: How does Mendel’s experiment show that traits are inherited independently?

Some facts:

Blood groups show multiple-allelism; there are three alleles A, B and O. Alleles A and B mutually expresses themselves when presenting together. We call this as co-dominance. Allele A and B show dominance only over allele O.

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