Can 2 O positive parents have an O negative child?

Asked By: Marisel Negrel | Last Updated: 7th June, 2020
Category: medical health medical tests
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Children who are Rh negative can have parents who are either Rh positive or Rh negative. Two parents who have O positive blood could easily have a child who is O negative. In fact, most children who are O negative have parents who are positive, since the +- combination is so much more common than the — combination.

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Beside this, can two O positive parents have a negative child?

Depending on the parents' rH genotype (hetero/homozygous for the D-antigen), the child of two O-positive parents could be either O-positive or O-negative. The only way their child could be O-negative is if both parents are heterozygous (Dd) for the D-antigen.

Also Know, what blood types make O negative child? The end result is an O negative child. Each of their kids has around a 1 in 8 chance of having O negative blood. This is possible because both O and Rh- are something called recessive traits. This means they can hide out in your DNA without you even knowing it.

Similarly, you may ask, what blood type will a child have if both parents are O positive?

Suffice it to say that A, B and AB are dominant over O, so children will be type O only if they inherit O-type genes from both parents. Children who inherit an A-O combination will be type A, but, remember, they could still pass that O gene off to their children.

What happens if one parent is O positive and the other O negative?

The O positive mom and the O negative dad can have a child with blood type A or blood type B depending on the O negative dad's blood type. They cannot have a child with blood type O. Can a parent with O negative blood type be the biological father of a child with AB blood type (the mother is A+)?

35 Related Question Answers Found

How common is O negative blood?

Only 7% of the population are O negative. However, the need for O negative blood is the highest because it is used most often during emergencies. The need for O+ is high because it is the most frequently occurring blood type (37% of the population). The universal red cell donor has Type O negative blood.

Can O positive and O negative marry?

Yes. The ABO blood type doesn't matter at all. The Rhesus factor (Rh factor) is the part of the blood type that is positive or negative. If the woman is Rh negative (A-, B-, AB-, or O-) and the baby is Rh positive then the mother starts making antibodies against the Rh+ factors in the baby's blood.

How do you get O negative blood?

Everyone has an ABO blood type (A, B, AB, or O) and an Rh factor (positive or negative). Just like eye or hair color, our blood type is inherited from our parents. Each biological parent donates one of two ABO genes to their child. The A and B genes are dominant and the O gene is recessive.

How do you inherit O negative blood type?

If an A or B gene is inherited along with the O gene, the A or B gene determines the person's blood type. A person is type O only if he/she inherits two O genes. You can see that the Rh-positive gene is dominant over the Rh-negative gene. A person's Rh type is negative only if they inherit two Rh-negative genes.

Do siblings have the same blood type?


No it doesn't. Neither of your parents has to have the same blood type as you. For example if one of your parents was AB+ and the other was O+, they could only have A and B kids. In other words, most likely none of their kids would share either parent's blood type.

Why is O positive blood so common?

The gene for type O is 'recessive', because if you have one gene for O and one for A, then you still end up with A antigens on your cell membranes, and the same goes for O and B. In order to be group O, you need both parent cells to be O. But group O is still more common simply because it is the ancestral form.

Do twins have the same blood type?

Identical twins will always have the same blood type because they were created from the same fertilized egg (fraternal twins can have different blood types — again, providing the parents do — because they are created by two fertilized eggs).

What is the golden blood type?

One of the rarest blood types in the world is Rhnull, sometimes referred to as 'golden blood'. People with this blood type have a complete absence of any of the Rh antigens.

What's the rarest blood type?

What's the Rarest Blood Type? In general, the rarest blood type is AB-negative and the most common is O-positive. Here's a breakdown of the most rare and common blood types by ethnicity, according to the American Red Cross.

Does a child always inherit the father's blood type?


Each biological parent donates one of their two ABO alleles to their child. A mother who is blood type O can only pass an O allele to her son or daughter. A father who is blood type AB could pass either an A or a B allele to his son or daughter.

What blood type does O negative and O positive make?

What are the major blood types?
If your blood type is: You can give to: You can receive from:
B Positive B+, AB+ B+, B-, O+, O-
AB Positive AB+ Only All blood types
O Negative All blood types O- only
A Negative A-, A+, AB-, AB+ A-, O-

What is O negative blood type?

O negative is the universal blood type. O negative blood type can only receive O negative blood. O negative donors who are CMV negative are known as Heroes for Babies at the Red Cross because it is the safest blood for transfusions for immune deficient newborns. In an emergency, it is the blood product of choice.

What is the best blood type?

There are four principle types: A which is for Agrarian, B for Bavarian, O for Original hunter, and AB is the most modern blood type and has the best immune system.

Is it rare to be O positive?

How common is O positive blood? O positive is the most common blood type as around 35% of our blood donors have it. The second most common blood type is A positive (30%), while AB negative (1%) is the rarest.

Is O blood type rare?


It's hard to say which blood type is the rarest in the world, since they're linked to genetics. However, in the United States, AB-negative is considered to be the rarest blood type, and O-positive the most common.

Can a child have a different blood type than both parents?

While a child could have the same blood type as one of his/her parents, it doesn't always happen that way. For example, parents with AB and O blood types can either have children with blood type A or blood type B. These two types are definitely different than parents' blood types! They will match both parents.

Can two O blood types make an A baby?

Two O parents will get an O child nearly all of the time. But it is technically possible for two O-type parents to have a child with A or B blood, and maybe even AB (although this is really unlikely). In fact, a child can get almost any kind of blood type if you consider the effect of mutations.