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Depends on the gene — blood types A and B are codominant; type O means the genes that code for either A or B blood proteins are not present, so there is no blood type per se. 40 percent of the world (but see next paragraph) is A, 40 percent O, 15 percent B, and 5 percent AB (this last one due to having one parent who passed down A, the other parent passed down B).

There’s also the M and N blood group, which is terribly rare, and for the most part (for now) geographically restricted to the area around the Bay of Bengal I think, maybe an artifact of blam’s Sundaland refugees. ;’)

For that matter, I’ve heard of something called Bombay Syndrome; the conventional blood test returns a result of A bloodtype, but the genes are just a hair different, and an A transfusion will kill the Bombay blood patient.

I have always been curious about this. My mother is AB, my fathers family and all my kids are O+ as were my dear Exes, Polish Lithuanian.

My Mother is also dark skinned, brown eyed, all her family is light skinned and blond to brownish, looks Southern European in a harpish kind of way, her whole family come from Northern Ireland and have been there since Christ, I am luring her up to my house for a DNA sample, a mystery to be solved.

When most people think of blood dyscraysia that can be fatal to a baby they usually think of the RH factor....My 2 first kids both had AB_O incompatibility.

I was O hubby was A or B (cannot remember which). Now there is no intermixing of my O blood with the baby,(cannot cross the placental barrier) but the baby from conception is foreign to my O type blood and I build up anti-bodies to the few sluffed off AB blood cells that can cross the plantcental barrier & gets into my system....The anti bodies that my system set up to attack the AB blood cells can cross the placental barrier and attack the blood of the baby I am carrying. Baby #2 was in trouble at birth. The anti bodies from me were still attacking his blood. They didn't let the umbilical cord dry up, because they thought they might have to do a complete transfusion on him....Every time they brought him to me he had another toe bandage on as they keep track of how he was fighting off my antibodies and he had a rash all over his body....after 3 days the doctor said he was doing much better and had passed the dangerous time for transfusion...I was told not to have any more children or they would probably not survive...

I had 4 more, but the last one only live 10 hours and had multiple problems....Spina Bifida mylomengesoceil. /sp. paralyzed from the waist down plus other birth defects...that's when I stopped having children...But I figure the last 3 that had no problem were probably O type or God just wanted them here...

sorry for some of the bad spelling...

I have an A+ blood type. I wish I had type 0 so I could sell a pint of blood for $50. The nurses say drink a pint of beer to get back to normal. That leaves me with money to buy a double quarter pounder with cheese, double fries, and a sixpack of beer to wolf it all down with. And $30 left over.

SO, if I did that before giving blood, the patient in the hospital will feel like he just had a sixpack, a double quarter pounder with cheese and double fries. And hit on the nurses, who will tell the doctor in charge the guy is too healthy to be laying around there. And get discharged.

BTW, that's how to get discharged out of a hospital if you are feeling well. Hit on the cute nurses.