My older sister's blood group is ABD negative, im A positive and my younger sister is O positive. is it possible we are not full sisters?
by 
kiteflyer
ANSWERS: 3
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I have never heard of ABD, but if three sisters have three different types, then there is a mistake somewhere. Parents each have one type, or maybe the same type, but one parent can not have two types. Everybody has just one blood type.
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Never heard of ABD, so I'm assuming you meant AB 1st sister = AB - 2nd sister = A + 3rd sister = O + Totally possible if your parents are: AO +- and BO +- Then with one girl, they gave the A, the B, and both - the second girl got the A, the O and either ++ or +- and the third girl got O and O, and either ++ or +-.
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http://www.biology.arizona.edu/human_bio/problem_sets/blood_types/inherited.html dont think its likely
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