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Predict a child's possible blood types from both parents, with probabilities.
Blood type is determined by the ABO gene system, where each parent contributes one allele (A, B, or O). Combined with the Rh factor, this produces 8 possible blood types.
| Type | Can Give To | Can Receive |
|---|---|---|
| O− | All types | O− |
| O+ | O+, A+, B+, AB+ | O+, O− |
| A− | A−, A+, AB−, AB+ | A−, O− |
| A+ | A+, AB+ | A+, A−, O+, O− |
| B− | B−, B+, AB−, AB+ | B−, O− |
| B+ | B+, AB+ | B+, B−, O+, O− |
| AB− | AB−, AB+ | A−, B−, AB−, O− |
| AB+ | AB+ | All types |
Formula
ABO Inheritance: Each parent donates one allele (A, B, or O). A and B are co-dominant; O is recessive.A allele = Produces A antigen on red blood cells (dominant over O)
B allele = Produces B antigen on red blood cells (dominant over O)
O allele = Produces no antigen (recessive to both A and B)
Worked Example
Parent 1: Type A (AO), Parent 2: Type B (BO)
Did you know? Type O is the most common blood type worldwide at 44% of the global population, while AB negative is the rarest at less than 1%. Blood type distribution varies significantly by ethnicity (source: American Red Cross).
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