* Blood Type A has A antigens on red blood cells and anti-B antibodies in the plasma.

* Blood Type B has B antigens on red blood cells and anti-A antibodies in the plasma.

* Blood Type AB has both A and B antigens on red blood cells but neither anti-A nor anti-B antibodies in the plasma.

* Blood Type O has neither A nor B antigens on red blood cells but has both anti-A and anti-B antibodies in the plasma.

So, two A blood types DO NOT equal a different type. Two people with blood type A will always have children with blood type A or blood type O.

Here's why:

* Each parent contributes one allele (a version of a gene) for the ABO blood group.

* Type A individuals can have either the AA genotype or the AO genotype.

* If both parents are AA, all children will be AA (type A).

* If both parents are AO, there's a 1:2:1 chance of the child being AA (type A), AO (type A), or OO (type O).

* If one parent is AA and the other is AO, all children will be either AA (type A) or AO (type A).

Let me know if you have any other questions!