Question

You are trying to determine somebody’s blood type. 1. You add anti-A serum to a drop of his blood. The blood clots. Which genotypes are possible? _________________________

2. You add anti-B serum to another drop of his blood; the blood clots Which allele is present? _________

3. You add anti-Rh+ serum to a third drop of his blood; the blood clots Which allele must be present? ____________

4. What is this person’s blood type? _________

Answer 1

You are trying to determine somebody’s blood type.

1. You add anti-A serum to a drop of his blood. The blood clots. Which genotypes are possible? If we add anti-A serum drop in the blood then if the blood clots this will prove that antigen A is present on the RBCs.

So, the can either be IAIA, IAIO, IAIB

2. You add anti-B serum to another drop of his blood; the blood clots Which allele is present?

If after adding anti-B serum there is clotting in blood then it means that the person also has B antigen. So, the genotype of the person will be IAIB.

3. You add anti-Rh+ serum to a third drop of his blood; the blood clots Which allele must be present?

If after adding anti-Rh+ serum there is again clotting of blood then it means that the person is AB+.____________

4. What is this person’s blood type? So, the person will be AB+