6 doctors weighed in:

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

6 doctors weighed in
Dr. David Galbraith
Pediatrics
4 doctors agree

In brief: 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.

In brief: 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.
Dr. David Galbraith
Dr. David Galbraith
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Dr. Richard Pollard
Anesthesiology

In brief: Maybe

Rhesus transmission (+ or -) is not a clear as the ABO transmission.
It is also separate from the genetics for "blood type". This is purely a result of the genetic expression of each parent, and this may be different when their genes are combined in a new child.

In brief: Maybe

Rhesus transmission (+ or -) is not a clear as the ABO transmission.
It is also separate from the genetics for "blood type". This is purely a result of the genetic expression of each parent, and this may be different when their genes are combined in a new child.
Dr. Richard Pollard
Dr. Richard Pollard
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