by 
Anonymous
ANSWERS: 6
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Use this blood type calculator http://www.biology.arizona.edu/human_bio/problem_sets/blood_types/btcalcA_popup.html It is from this web site http://www.biology.arizona.edu/human_bio/problem_sets/blood_types/Intro.html According to this site, it is possible.
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Yes it is possible: Your mom will donate an o regardless. The genotype (keep in mind this is simplified much) of you father must be Ao. They both donate an o and you have o blood. As for the (-), that indicates the presence of a certain Rf antigen and that combo is also possible.
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Obviously it is.
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Yes, it's possible because of recessive genes. You get two alleles, or variables, for blood type. Obviously, your mom's dominant blood type is O+, and your dad's dominant blood type is A+. The ones that are NOT expressed unless in the presence of another like itself are called recessive. That being said, it would be impossible for you to display the recessive O- blood type unless BOTH of your alleles were recessive. That means both of your alleles are O-. Because you get one allele from each parent, your parents must be O+/O- and A+/O- in order for you to have O- blood type. THE ALTERNATIVE EXPLANATION/SOLUTION: Ask your postman what his blood type is, then slap your mom in the face for being cheaper than a 99cents store. LOL.
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mum is 00, father is ao,so you can be 00 blood mum is also +- father also +-,so you can have o- blood
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