Is it possible for a newborn baby to have a blood type differ than her parents?
Wednesday, March 17th, 2010 at
12:14 am
For example, Mother blood type is O+ and Father is A+, so their newborn baby should have blood type either O+ or A+.
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Well, in the example you gave, the baby does have to have O or A+. But say the parents have type A and B…the child could have either A, B, AB, or O. It is just the genotypes that cause that. If the child was O (from those parents I mentioned), it would the parents are AO and BO on their genes and both passed the O. If the child was AB, each parent passed their showing gene (phenotype). If the child is A, the mother passed an A and the dad an O and vise versa for a child with B blood. But since the mother in your example can only pass O blood and the father can only pass A or O, the baby has to have A or O. Get it? It is a little confusing.
Nope.
rH+ is a dominant trait, meaning a person with rH+ blood can carry either two positive genes, or a positive gene and a negative gene. The parent that is negative carries two negative genes. If the parent that is positive passes on a negative gene the baby will be rH-
So in your example the baby could be either A+, A-, O+, or O-.
However if the parents are A an B blood types then as A and B are dominant the parents could both carry the O gene. If they do then the baby can be type A, B, AB, or O.
http://www.biology.arizona.edu/Human_Bio/problem_sets/blood_types/inherited.html
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. This couple could have children of either blood type A (O from mother and A from father) or blood type B (O from mother and B from father).
Inherited Blood type
of child
O from the mother
A from the father A
O from the mother
B from the father B
Since there are 4 different maternal blood types and 4 different paternal blood types possible, there are 16 different combinations to consider when predicting the blood type of children.
Blood Type Calculator
The following Blood Type Calculator lets you determine the *possible* blood type of a child, given the blood types of the two biological parents or the *possible* blood types of one biological parent, given the blood types of the child and the other biological parent. We emphasize “possible” because, in most cases, blood typing is not conclusive when attempting to determine, include or exclude an individual as the parent of an offspring.
This calculator is based solely on theoretical principles. It would be a mistake to use this information to make any conclusions about your own family tree. Anyone wishing personal information about their own blood type inheritance is encouraged to contact their health care provider.