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5 answers

O blood type is a recessive trait.
Both your parents are carriers of this gene and you managed to get 2 recessive copies of it.

If you get 2 recessive genes you show the trait expressed in the recessive gene.
If you get a recessive and dominant (type A or B) then you are expressed as dominant and your blood type would be A,B or AB
However, if both your parents blood type is AB they can't be your parents because then they don't carry the O gene.

2007-01-17 10:03:55 · answer #1 · answered by Beef 5 · 2 0

As with most things in life, there is an exception to the rule of blood types. Sometimes a child can display a phenotype that does not correspond to the phenotypes of the parents. For example, a Type A father and a Type O mother can give birth to a baby with the blood type AB. Logically this seems impossible; how can a mother with type O and father with Type A have a baby that is neither type A nor type O? The answer lies within another antigen. The H antigen is the precursor to the A and B antigens. If the H antigen is inherited as recessive (hh), it will never develop into an A or a B antigen. The result is that the phenotype (the trait that is actually expressed in the person) will appear to be O, even though the genotype (the combination of the two alleles) might be A or B. When this occurs, it is possible for a child to have a phenotype that does not correspond with the parents. [Hence, blood tests for paternity purposes are not as accurate as those performed by testing DNA.]

2007-01-17 18:16:27 · answer #2 · answered by Sunhouse 2 · 0 0

Not necessarily. The ABO blood type system works with I^A, being A blood type, I^B being B blood type, and i being the O blood type. What ends up happening is that you have two of these. for example, an AB blood type would be I^A I^B. You get one of each from both of your parents. If your mother is an A blood type, chances are that she is I^A, i and if your father is an A blood type as well, he is also I^A, i. The same works for B blood type. You just got i,i from both parents.

Chances are, you really are your father's daughter.

2007-01-17 18:12:13 · answer #3 · answered by buttercup 3 · 0 0

O is the recessive form for the blood type alleles. This means that both of your parents are carriers for O blood type, and that you received the recessive "o" gene from both parents. Unless one of your parents is type AB, it is quite possible that you have O blood.

The +/- part of blood is from a different gene. Unless both of your parents are -, there's a chance you could be +.

2007-01-17 18:13:15 · answer #4 · answered by David 3 · 0 0

What Beef said is probably the case. Or you could be adopted. Ask your parents.

2007-01-17 18:08:15 · answer #5 · answered by *Cara* 7 · 0 0

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