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While the DNA Help ABO blood type calculator can
be used to predict possibilities of paternity, it is not a
conclusive predictor for legal purposes and cannot be used as
evidence at court.
The calculator is used to determine either:
- The ABO blood type of the child when the blood type of
the mother and the father are known (top chart).
- The ABO blood type of the father if the blood type of
the mother and the child are known (bottom chart).
DNA Help ABO Blood Type Calculator:
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Father’s Blood Type
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A
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B
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AB
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O
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| Mother’s Blood Type
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A
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A or O
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A, B, AB, or O
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A, B, or AB
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A or O
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Child’s Blood Type Must Be
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| B
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A, B, AB, or O
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B or O
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A, B, or AB
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B or O
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| AB
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A, B, or AB
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A, B, or AB
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A, B, or AB
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A or B
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| O
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A or O
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B or O
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A or B
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O
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Child’s Blood Type
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A
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B
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AB
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O
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| Mother’s Blood Type
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A
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A, B, AB, or O
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B or AB
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B or AB
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A, B, or O
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Father’s Blood Type Must Be
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| B
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A or AB
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A, B, AB, or O
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A or AB
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A, B, or O
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| AB
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A, B , AB, or O
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A, B , AB, or O
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A, B, or AB
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| O
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A or AB
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B or AB
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A, B, or O
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ABO blood types can be complicated to understand. This is mostly due
to the fact that the 'O-type' antigen is masked by the presence of an
A- or B-type antigen. This is explained in the following chart, showing
the different the genotypes that make up the blood types.
| Genotype (DNA) |
Blood Type |
| AO or AA |
A blood type |
| AB |
AB blood type |
| BO or BB |
B blood type |
| OO |
O blood type |
For example, two O blood type parents can produce a child with only O
blood type. Two parents with A blood type can produce a child with either
A or O blood types. Two parents with B blood type can produce a child with
either B or O blood type. One parent with A and another with B can produce
a child with A, B, AB or O blood types. If one parent has A, and another
has AB, they can either produce a child with A, B or AB blood types. If
one parent has A, and another has O, they can either produce a child
with A or O blood types.
Rh Positive (Rh+) and Negative (Rh-) Blood Types
The Rh (+/-) factor is inherited separately from the ABO blood types.
Similarly to the masking effect of the O gene in ABO blood types, the Rh
negative (Rh-) gene is also masked by the presence of an Rh positive (Rh+)
genotype. Therefore, a person may have a Rh + blood type and can still have
an Rh - gene (See the chart below). Furthermore, 2 parents with Rh + blood
types can have a child with Rh - blood type.
| Genotype (DNA) |
Blood Type |
| (+ , -) or (+ , +) |
Rh + |
| (- , -) |
Rh - |
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