Wow so if I'll lose blood in some accident I wouldn't have many donors huh?..
Hmm, if you're A, and I'm B, that doesn't seem like a good idea, hon. You see, (oh gosh, going into Biol mode here, and that was a long time ago...)
blood types can only give to the same blood type.
A to A
B to B, AB to AB and etc.
The universal donor would be O
and the universal recipient would be AB (or I might have mixed them up)
Since the (forget name here) 'thingy' found on the surface of the blood cells is used as an identification factor (some sort of lipoprotein or lipid I think, I'll call it your 'identification' that can be found on the surface of the cells) oppossing blood types would only try to destroy each other, and ultimately, your plasma would coagulate and sadly, try to kill you.
As for the + or - going along with the blood type, I know even less about that. (brain leakage here, sorry) Maybe it has something to do with a specific 'protein' or another factor that happen s to be in your blood?
+ means it's present, - means it isn't.
I have no further information on this except that it becomes VERY important during childbirth, especially regarding the baby and the mother, and whether one of them happens to have it or not. Something about the coagulation of mixed blood yet again...
Oops, I went on longer than I thought. Drat. So
Raspberry, I wouldn't be a good candidate for you, look for someone with O and go hunt them down.
