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A 39-year-old member asked:

Can a child have a different blood type from either of his parents?

3 doctor answers9 doctors weighed in
Dr. Mark Gordon
Colon and Rectal Surgery 54 years experience
Yes: Blood types are inherited from both parents.
Dr. David Miller
Dr. David Milleranswered
Family Medicine 10 years experience
Complicated genetics: The genetics of blood type are fairly complex. It is indeed possible for a child to have a blood type different from either parent. There are, however, certain parent-child combinations of blood types that cannot occur together. Here's a website that explains it pretty well. http://learn.genetics.utah.edu/content/begin/traits/blood/.
Dr. Richard Pollard
Anesthesiology 30 years experience
Yes : The genetic transmission of blood type depends on the fact that each parent has two genes for blood type. That is to say a person with blood type a could have genes of aa or ao. If a parent with blood type ao (one version of a) has a child with a parent with blood type bo (one version of b) , the child could still be blood type o.

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Similar questions

FL
A 44-year-old female asked:

Can a child have different blood type than their parents, if one has A+ and O-?

1 doctor answer4 doctors weighed in
Dr. Stuart Janousky
Pediatrics 37 years experience
Blood type: Your child should be either A or O. Not B or AB. They could be either positive or negative however.
Philippines
A 23-year-old male asked:

Can an ab and o blood type parents have o blood type child?

1 doctor answer2 doctors weighed in
Dr. Nayla Mumneh
Allergy and Immunology 29 years experience
Unlikely: A and b are more dominant.
Dr. Ed Friedlander
Pathology 44 years experience
Mendel's laws allow a classic O and a classic AB parent to have children with type A or type B, but not type O or type AB. Rare alleles could allow this to happen. If there is any question about the child's paternity, get it resoved using 21st century methods.
Feb 20, 2013
A 42-year-old member asked:

My blood type is completely different from my parents. How is this possible?

1 doctor answer1 doctor weighed in
Dr. Gurmukh Singh
Pathology 49 years experience
Need to know : Blood types of all parties. You parents may be blood group a and b and you may be o and that would be normal. Please resubmit your question with blood types of your parents and yours.
A 40-year-old member asked:

Can a child have a negative blood type if both of her parents are o positve?

2 doctor answers6 doctors weighed in
Dr. David Galbraith
Pediatrics 48 years experience
Yes: Each parent has two rh genes. It only takes one positive gene to make a person rh positive, so each parent can have a positive and a negative rh gene. Both genes have to be rh negative for someone to be rh negative. Since each parent only contributes one gene to child, the child can get a negative gene from each parent and therefore be rh negative.
A 48-year-old member asked:

Is it possible to have both parents with o positive bloodtype, but their child have o negative blood type?

2 doctor answers4 doctors weighed in
Dr. James Ferguson
Pediatrics 46 years experience
Yes: The rh factor is inherited through separate genetic means from the blood type. The rh factor is a dominant gene, meaning only one gene is needed to cause expression of the factor. So two rh + parents can have a rh+/rh- gene pattern and have a 1/4 chance with every conception of having an rh-/rh- baby, 1/4 chance of rh+/rh+ baby and 1/2 of carrier rh+/rh-.

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Last updated Jun 12, 2018
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