"Blood" vs. genetics in the HP books (Was: Magic genetics)

[h2so3f]

No: HPFGUIDX 146570

CH3ed:
I don't think we can explain magic with genetics or ABO blood 
typing... But.. There's no harm in having fun, ay? How about squibs 
being the result of Bombay phenotype? 

The AB antigens are modified form of the H-antigen stub on the red 
cell surface by 2 different sugars. People with O bloodtype has 
unmodified H stub. People with "Bombay phenotype"; however, doesn't 
have the H stub to begin with, and so even if they have the gene for A 
or B sugar, the sugar won't stick to the RBC surface because of the 
lack of H stub... So their bloodtype is defaulted O. Tho unlike the 
normal O types, they can give birth to AB children. And they can't get 
blood transfusion from the universal doner O negative either because 
they would react to the H antigen.

CH3ed :O)