It's a matter of genetics. If you recall the Punnet Square from high school biology, that should help.
Review: blood type is determined by alleles, which are gene variations. The alleles that determine blood type in humans are A, B, and O. Several other genes key for absence or presence of the Rh protein (which is the - or + of the blood type). A and B are codominant, which means that they will mask the manifestations of an O, but will not mask each other. O is recessive. I think that presence of the Rh protein is dominant over the lack thereof.
If the mother is A positive, she has the Rh protein and may either be AA or AO (blood type is determined by an allele from each parent). Let's say she is AO. If the father is O negative, he has no Rh protein and his genotype is OO. So their baby will has a fifty percent chance of having the Rh protein, and has a fifty percent chance of being type A (genotype AO) and a fifty percent chance of being type O (genotype OO).
I hope that helps. If you find that you need further clarification, chat with a biology instructor.
2006-10-28 16:42:23
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answer #1
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answered by Rat 7
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Genetic Inheritance Patterns
ABO blood types are inherited through genes on chromosome 9, and they do not change as a result of environmental influences during life. An individual's ABO type is determined by the inheritance of 1 of 3 alleles (A, B, or O) from each parent.
Both A and B alleles are dominant over O. As a result, individuals who have an AO genotype will have an A phenotype. People who are type O have OO genotypes. In other words, they inherited a recessive O allele from both parents. The A and B alleles are codominant. Therefore, if an A is inherited from one parent and a B from the other, the phenotype will be AB. Agglutination tests will show that these individuals have the characteristics of both type A and type B blood.
2006-10-28 16:31:11
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answer #2
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answered by happymommy 4
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To simplify child has a combination of both mother and fathers blood type.
If you are A+ it really looks like AO+
If you husband is B+ it looks like BO+
You kids could have AB+, OO+, BO+, AO+.... you see...
The confusion comes it the short cut that medical people use... they say oh you are A+ instead of saying AO+, they don't say it is because O basically mean no antigen on the blood.
Another example: you are O-, It really is OO-
Your husband is AB+ AB+
You kids could be AO+, BO+
So when one of you have RH factor the (+), your kids will always be positive. That's why there is so little of O- blood around.
For O negative you have to have OO-
For that you parents have to be either AO-, BO-, OO-.
Bottomline is you both contribute to your childs blood type equally. Don't let anyone tell you otherwise.
Hope this is clear as mud.
2006-10-28 17:36:12
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answer #3
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answered by pp 2
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The child makes it's own although it can have the same type as one parent for example one of my parents was O- and the other was A- both children were A-
2006-10-28 16:33:38
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answer #4
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answered by Bast 5
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Blood type will be contributed to the genetic makeup of the infant by both parents. Did all 5 of you really do that bad in 10th grade biology?
2006-10-28 16:32:48
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answer #5
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answered by OU812 5
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The baby's blood type could be either or. I have 2 children and the oldest one is A positive like his father and my youngest on is O negative like me.
2006-10-28 16:36:27
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answer #6
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answered by ? 2
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It is usually a combination of the two. But the stronger genetics usually determines the blood type.
2006-10-28 16:33:20
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answer #7
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answered by crashvander 2
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Usually it goes by who has the dominate gene in the relationship. My father had A+ and my mother had O- and since A+ is a dominate blood gene, I have his...Go to the site below and it shows you the layout of everything...have fun
2006-10-28 16:32:04
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answer #8
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answered by cocoa198517 2
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My daughter has the same blood type as my husband and I - Type A.
2006-10-28 16:29:11
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answer #9
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answered by ? 6
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the baby usually has its own blood because none of my parents have o positive blood and i have o positive blood.
2006-10-28 16:29:42
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answer #10
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answered by **Sam**[[loves someone special]] 2
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