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What your parents are blood wise shouldn't affect what you are. My dad is an AB- and my mum is a B positiive yet I'm an O rhesus positive This isn't exactly true. Blood type is absolutely a congential issue. It is possible for you to have O blood because your mother and your father may have a heterozygous genotype for this trait. They may be IA i in case of your mother and IA i or IB i for your father. If, however, your father has AB blood, then there is no way for you to have O blood since you will have either A blood, B blood, or AB blood.

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Q: If your mother is A positive not to sure of your dad but you know its not O type and both your sisters are also A's and B's can you be an O?
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Yes, if both parents have genotype AO.


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The mother must be heterozygous b and the father must be both heterozygous b and heterozygous positive.


Can a mother have B positive and father have B positive and have an O positive baby?

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Can a A positive father and a B positive mother make an AB positive baby?

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