Does your babies blood type depend on yours?

Question

I'm pregnant and just wondering if the babies blood type comes from mother/father or if it can be a completely different type??

Answer 1

Although many people understand how the major blood groups are inherited, the Rh factor (the + or - sign after the blood type) is more confusing.

To begin with, you normally have two alleles (out of a possible three alleles - A, B, O) for your blood type and pass one of them to your child.

A person who has a type A blood type can have either two A alleles (AA) or they can have one A and one O (AO). The same for someone of blood type B, who can be either BB or BO.

If you are type O, then you will pass an O allele to your child because you must be OO. If you are AB, you can pass either the A or the B to your child.

For parents who are both type A, they can both be either AO or AA. Therefore, they could pass an A or an O to their child and they could have a child with either type A blood or type O blood. This child could not be type B or type AB.

Just like you have two copies of the A, B or O alleles, you also have two copies of the Rh factor alleles. So for two parents who are both Rh positive, they could be either +/ - or +/+. If both of them are +/-, then they could have each passed the - allele to their child and have a negative (-/-) child.

So two A+ parents could have children with the following blood types:

A+, A-, O+, O-

How about if one parent was A- and the other was A+?

Again, the baby could be either A+, A-, O+, O-. While the A- parent would only give an Rh- factor, the other parent could donate either a + or a - depending on whether he was -/+ or +/+.

What if they were both A-?

Then their baby could only be either A- or O-, since both parents are Rh - they must be -/- and can only give a - to their child. This child could not be A+ or O+ with two parents that are A-.

How about if mom is A+ and dad is B+?

In this case, mom could be either AA or AO and have either +/+ or +/- Rh factor alleles. So she could give her baby either an A or O allele and either a + or - Rh factor allele.

Dad could be either BB or BO and will also have either +/+ or +/- Rh factor alleles, and could give his baby either a B or O allele and either a + or - Rh factor allele.

So the baby could be either:

AB : getting A from mom and B from dad
A (AO) : getting A from mom and O from dad
B (BO) : getting O from mom and B from dad
O (OO) : getting O from mom and O from dad
And his Rh factor could be either + or -, depending on which Rh factor allele he inherits from each parent. So this baby could have any of the possible blood types.

With newer DNA testing, using blood types to determine paternity, or who the father is, isn't really that useful anymore. The main problem is that this method just tells you what the blood type the father could or could not have, and since many of these blood types are common, it doesn't necessarily help narrow down who the father could be.

Still, it sometimes does come up when a baby's blood type isn't what the parents expect it to be.

Answer 2

Baby Blood Type

Answer 3

Blood typing can only rule OUT a parent; it cannot rule a parent IN. That is, if the baby's type matches with the possible types from mom & dad, that does not prove the father is the baby's true father. If the blood type does NOT match the possible types from mom & dad, that proves that one of them is not the baby's true parent. With a type O father: If mom is AB, the baby can be either A or B. It cannot be AB or O. If mom is A, the baby can be either A or O. It cannot be AB or B. If mom is B, the baby can be either B or O. It cannot be AB or A. If mom is O, the baby can only be type O. It cannot be AB, A, or B.

Answer 4

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If you are O+, you can never have AB+/- child You can have either A or B or O children depending on blood group of your partner. simple explanation. each persons blood group is based on two genes. One of which comes from mother and the other from father. There are only 3 possibilities as to the gene that the child will receive from a parent. These are A,B or o gene. o is written small because it is recessive gene. A person with blood group O means he has received an o gene from mother and another o gene from father. his gene pair is (oo) A person who has got at least one A or one B gene will have blood group of that name because these genes are dominant over the o gene. So (Ao) and (AA) gene pairs make blood group A. (BB) and (Bo) gene pairs make blood group B. A person with blood group AB will have gotten an A gene from one parent and B from the other. You, my friend have blood group O = gene pair (oo) and can give only o gene to your child. Your child's gene pair can only be (Ao) or (Bo) or (oo) depending on what the child gets from the other parent. The o in each of these pairs will come from you. This is of little advantage in many cases e.g if a child with disputed paternity has been claimed by two persons both having same blood group. The +/- may be important in cases e.g both parents are -ive and child is +ive. So father is not actual father. Or if both parents are -ive and child is --ive but a person who is +ive is claiming he is the father. Also very rarely mutations can arise. So while a parent may donate an A gene to the child, the gene has mutated and doesn't function and child will not form the A antigen or the anti A antibody. In same way a +ive parent can give birth to a -ive child.

Answer 5

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RE:
Does your babies blood type depend on yours?
I'm pregnant and just wondering if the babies blood type comes from mother/father or if it can be a completely different type??

Answer 6

There are only certain types that can occur from what the 2 parents are.
For example, 2 POSITIVE blood types will never make a NEGATIVE blood type.
There are others, but I don't know what they are.

Answer 7

The baby's parents both influence the baby's blood type, but depending on how genes are randomly divided up, the baby may actually end up with a different blood type than his or her parents. Check out this link: http://www.paternityangel.com/Articles_zone/Blood/BloodType1.htm

Answer 8

It has to come from a parent, the baby will either have your blood type r your partner

Answer 9

It depends on the blood type of the parents, as richmond*girl has so perfectly explained.

Answer 10

My blood type is the same as my moms.... A Rh-, but my brothers came from his dad... a+, my hubby is A+ and my son is A+, it just depends.... It doesn't depend on yours, but just what DNA he/she gets....

Robin