Baby Blood Type Calculator
Predict genetic probabilities of a child's blood type based on parental genetics. Uses Mendelian inheritance logic.
About
Blood type inheritance follows Mendelian genetic laws, where a child inherits one allele from each parent. The ABO blood group system is controlled by the ABO gene, with A and B being co-dominant and O being recessive. The Rh factor (Positive or Negative) is inherited independently, where Positive is dominant over Negative.
This calculator performs a Punnett Square simulation to determine the statistical probability of the offspring's blood type. It is useful for parents curious about their future child's traits or for understanding genetic compatibility issues such as Rh disease. Note that while this tool covers standard genetics, rare mutations or chimerism are excluded.
Formulas
The probability P of a specific genotype is calculated by crossing parental alleles. For phenotype A, the possible genotypes are AA and AO. For phenotype O, the genotype must be OO.
Where Ntarget is the number of quadrants in the Punnett Square matching the target blood type. Rh factor probability is calculated separately:
Reference Data
| Parent 1 | Parent 2 | Possible Child Types | Impossible Child Types |
|---|---|---|---|
| O | O | O | A, B, AB |
| O | A | O, A | B, AB |
| O | B | O, B | A, AB |
| A | A | A, O | B, AB |
| A | B | A, B, AB, O | None |
| B | B | B, O | A, AB |
| AB | O | A, B | AB, O |
| AB | A | A, B, AB | O |
| AB | B | A, B, AB | O |
| AB | AB | A, B, AB | O |