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Can children have negative blood positive parents

Author

Mia Smith

Published Mar 29, 2026

The answer is yes — but only if neither parent passes along Rhesus D.

Can you have negative blood if your parents are positive?

Each person has two Rh factors in their genetics, one from each parent. The only way for someone to have a negative blood type is for both parents to have at least one negative factor. For example, if someone’s Rh factors are both positive, it is not possible for his or her child to have a negative blood type.

Can parents have a child with a different blood type?

Is it possible for a child to have different blood type than both of its parents? Yes, a child is able to have a different blood type than both parents. Which parent decides the blood type of the child? The child’s blood type is decided by both parents’ blood type.

Can a positive parents have O negative child?

Yes, Mom or Dad may be positive, but that recessive negative gene is still floating around in his or her DNA. If it becomes paired with another negative gene from a similar positive-negative parent, that child will be negative even though both parents are positive.

Can two B positive parents have AB negative child?

Genotype (DNA)Blood TypeOOO blood type

How rare is a negative blood?

Blood typePrevalence in the United States (Percentage of the United States population)AB negative (AB-)0.6% (Rarest)AB positive (AB+)3.4%O negative (O-)6.6%O positive (O+)37.4%

What are the 3 rarest blood types?

  • O positive: 35%
  • O negative: 13%
  • A positive: 30%
  • A negative: 8%
  • B positive: 8%
  • B negative: 2%
  • AB positive: 2%
  • AB negative: 1%

Can siblings have positive and negative blood types?

So, is it possible for two people who are Rh-positive to produce a child that’s Rh-negative? The answer is yes — but only if neither parent passes along Rhesus D.

Which parent determines blood type?

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. For example, if an O gene is paired with an A gene, the blood type will be A.

Can 2 A+ parents have an a child?

Yes. Blood typing requires two alleles (one from mom and one from dad). Type A blood either has AA (an A from each parent) or AO (because the A is dominant and the O is recessive).

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What's the rarest blood type?

In the U.S., the blood type AB, Rh negative is considered the rarest, while O positive is most common.

Is Rh negative A blood type?

If your blood has the protein, you’re Rh positive. If your blood lacks the protein, you’re Rh negative. Rh positive is the most common blood type. Having an Rh negative blood type is not an illness and usually does not affect your health.

Do siblings have same blood type?

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!

What's the golden blood type?

The golden blood type or Rh null blood group contains no Rh antigens (proteins) on the red blood cell (RBC). This is the rarest blood group in the world, with less than 50 individuals having this blood group.

What is it called when mom and baby have different blood types?

Rh disease occurs during pregnancy. It happens when the Rh factors in the mom’s and baby’s blood don’t match. It may also happen if the mom and baby have different blood types.

What happens if mom is Rh-negative and dad is Rh positive?

If the mother is Rh-negative and the father is Rh-positive, there is a good chance the baby will have Rh-positive blood. Rh sensitization can occur. If both parents have Rh-negative blood, the baby will have Rh-negative blood. Since the mother’s blood and the baby’s blood match, sensitization will not occur.

Is a negative blood good?

Why is A negative blood important? A negative red blood cells can be used to treat around 40% of the population. However, A negative platelets are particularly important because they can be given to people from all blood groups. That’s why A negative platelets are called the ‘universal platelet type’.

Is Rh negative the same as O negative?

Blood is further classified as being either “Rh positive” (meaning it has Rh factor) or “Rh negative” (without Rh factor). So, there are eight possible blood types: O negative. This blood type doesn’t have A or B markers, and it doesn’t have Rh factor.

What race has the most O negative blood?

O-negative blood type is most common in the U.S. among Caucasian adults, at around eight percent of the Caucasian population, while only around one percent of the Asian population has O-negative blood type.

What are the disadvantages of a negative blood group?

Having a negative blood group does not have consequences as such but being a rare group makes it difficult to get the blood group at the time of injury. Another disadvantage is that if the mother is Rh negative whereas the son is Rh positive, it leads to high risk of getting infected with erythroblastosis fetalis.

Why is a negative blood group rare?

There are dozens of blood typing systems, but most people are familiar with the ABO and Rh systems, which provide the eight basic blood types. Generally, AB-negative is considered to be the rarest blood type. However, because blood type is linked to genetics, there is no single type considered the rarest worldwide.

What blood types should not have babies together?

When a mother-to-be and father-to-be are not both positive or negative for Rh factor, it’s called Rh incompatibility. For example: If a woman who is Rh negative and a man who is Rh positive conceive a baby, the fetus may have Rh-positive blood, inherited from the father.

How do I find out my blood type without a test?

Without drawing blood A person may be able to use a saliva sample to test for their blood type, as some people produce the characteristic antigens in their saliva. According to 2018 research , if a person does secrete these antigens in their saliva, a sample of dried saliva can reliably indicate their blood type.

Which blood group should not marry?

Transfer of maternal antibodies across the placenta occurs. This happens when Rh +ve man marries Rh-ve lady. So Rh +ve man should try to avoid marrying Rh-ve lady. Newborn with erythroblastosis fetalis may need an exchange transfusion.

What is the best blood type to have?

Types O negative and O positive are best suited to donate red blood cells. O negative is the universal blood type, meaning that anyone can receive your blood. And O- and O+ blood are both extra special when it comes to traumas where there is no time for blood typing.

Does same blood group of parents affect child?

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.

Can siblings with same parents have different blood types?

Yes, two siblings from the same parents can have different blood groups from their parents. This is because the four ABO blood groups, A, B, AB and O, arise from a child inheriting any one of each blood group gene forms (or alleles) A, B or O from each biological parent.

Do siblings have the same blood type if they have the same parents?

It depends on the blood types of the parents. Siblings share 50% of their genes, so they would have 50% of their alleles in common, on average. There are two pieces of information that determine blood type: the ABO type and the Rh type. People can be A, B, O, or AB for their ABO type.

What is the most common blood type in China?

In most areas of China, the distribution characteristics of ABO blood groups were O > A > B > AB. Similar results were seen in the studies conducted in South-West Nigeria. However, in other regions, such as Pakistan, B blood groups was the most common, while in Istanbul, the A blood groups was the most common.

What is the oldest blood type?

Blood type A is the most ancient, and it existed before the human species evolved from its hominid ancestors. Type B is thought to have originated some 3.5 million years ago, from a genetic mutation that modified one of the sugars that sit on the surface of red blood cells.

How do I know my blood type?

  1. Ask your parents or doctor.
  2. Blood draw. Next time you go in to get your blood drawn, ask to know your blood type. …
  3. At-home blood test. You can also purchase an at-home blood test online and have it shipped to your door. …
  4. Blood donation. …
  5. Saliva test.