Blood Type Calculator

Blood Type Calculator/Paternity

The blood type calculator in circulation is wrong.
It is outdated and based on simplification ignoring important possibilities.
It is irresponsible to either refer people to it or keep it online.
Here are the possibilities in offspring based on two parents’ blood types:

If the two parents are blood types …

O and O

The children can only be blood type O.

A and O

The children can only be blood types A and O.

B and O

The children can only be blood types B and O.

AB and O

The children can be either blood types:
a) A and B. (The AB parent is regular pheno and genotype AB)
b) AB and O. (The AB parent is cisAB/O)
c) AB and A. (The AB parent is cisAB/A)
d) AB and B. (The AB parent is cisAB/B)
e) AB. (The AB parent is cisAB/cisAB)

A and A

The children can only be blood types A and O.

A and B

The children can have all blood types, O, A, B and AB.

A and AB

The children can be either blood types:
a) A and B.
b) AB, A and O.
c) AB and A.
d) AB and B.
e) AB.

B and B

The children can only be blood types B and O.

B and AB

The children can be either blood types:
a) A and B.
b) AB, B and O.
c) AB.
d) AB and B.
e) AB.

AB and AB

The children can be either blood types:
a) A, B and AB.
b) AB and O.
c) AB and A.
d) AB and B.
e) AB.
Note: There are several combinations possible resulting in the above possibilites as one, neither or both
parents can be either regular pheno and genotype AB and also cisAB with A, B, O or cisAB as the other allele in the genotype.

Note:
In this world there are cases of blood types changing, chimerism, mutations taking place and high volumes of errors in blood typing.
Before you conclude anything, speak to your mother in private.
Taking a DNA test in addition can also help get you closer to the truth.
Whatever the case may be, blood types are great indicators.
But in order to be 100 percent, do not rely on blood types alone in terms of determining paternity.

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