Parent-Child Inheritance Chart
Explore all 64 possible parent blood type combinations and discover the potential blood types their children could inherit. Hover over any cell to see detailed probability breakdowns.
How to Use This Chart
- • Desktop: Hover over any cell to see possible child blood types and their probabilities
- • Mobile: Tap any cell to view details
- • Color coding: Green (high probability), Yellow (medium), Gray (impossible)
O-
O+
B-
B+
A-
A+
AB-
AB+
O-
O-, O+
O- × O-
O-: 100%
O+: 0%
O+, O-
O- × O+
O+: 75%
O-: 25%
4 types
O- × B-
B-: 75%
O-: 25%
B+: 0%
O+: 0%
4 types
O- × B+
B+: 56%
B-: 19%
O+: 19%
O-: 6%
4 types
O- × A-
A-: 75%
O-: 25%
A+: 0%
O+: 0%
4 types
O- × A+
A+: 56%
A-: 19%
O+: 19%
O-: 6%
4 types
O- × AB-
A-: 50%
B-: 50%
A+: 0%
B+: 0%
4 types
O- × AB+
A+: 38%
B+: 38%
A-: 13%
B-: 13%
O+
O+, O-
O+ × O-
O+: 75%
O-: 25%
O+, O-
O+ × O+
O+: 94%
O-: 6%
4 types
O+ × B-
B+: 56%
B-: 19%
O+: 19%
O-: 6%
4 types
O+ × B+
B+: 70%
O+: 23%
B-: 5%
O-: 2%
4 types
O+ × A-
A+: 56%
A-: 19%
O+: 19%
O-: 6%
4 types
O+ × A+
A+: 70%
O+: 23%
A-: 5%
O-: 2%
4 types
O+ × AB-
A+: 38%
B+: 38%
A-: 13%
B-: 13%
4 types
O+ × AB+
A+: 47%
B+: 47%
A-: 3%
B-: 3%
B-
4 types
B- × O-
B-: 75%
O-: 25%
B+: 0%
O+: 0%
4 types
B- × O+
B+: 56%
B-: 19%
O+: 19%
O-: 6%
4 types
B- × B-
B-: 94%
O-: 6%
B+: 0%
O+: 0%
4 types
B- × B+
B+: 70%
B-: 23%
O+: 5%
O-: 2%
8 types
B- × A-
AB-: 56%
B-: 19%
A-: 19%
O-: 6%
AB+: 0%
B+: 0%
A+: 0%
O+: 0%
8 types
B- × A+
AB+: 42%
AB-: 14%
B+: 14%
A+: 14%
B-: 5%
A-: 5%
O+: 5%
O-: 2%
6 types
B- × AB-
B-: 50%
AB-: 38%
A-: 13%
AB+: 0%
B+: 0%
A+: 0%
6 types
B- × AB+
B+: 38%
AB+: 28%
B-: 13%
AB-: 9%
A+: 9%
A-: 3%
B+
4 types
B+ × O-
B+: 56%
B-: 19%
O+: 19%
O-: 6%
4 types
B+ × O+
B+: 70%
O+: 23%
B-: 5%
O-: 2%
4 types
B+ × B-
B+: 70%
B-: 23%
O+: 5%
O-: 2%
4 types
B+ × B+
B+: 88%
B-: 6%
O+: 6%
O-: 0%
8 types
B+ × A-
AB+: 42%
AB-: 14%
B+: 14%
A+: 14%
B-: 5%
A-: 5%
O+: 5%
O-: 2%
8 types
B+ × A+
AB+: 53%
B+: 18%
A+: 18%
O+: 6%
AB-: 4%
B-: 1%
A-: 1%
O-: 0%
6 types
B+ × AB-
B+: 38%
AB+: 28%
B-: 13%
AB-: 9%
A+: 9%
A-: 3%
6 types
B+ × AB+
B+: 47%
AB+: 35%
A+: 12%
B-: 3%
AB-: 2%
A-: 1%
A-
4 types
A- × O-
A-: 75%
O-: 25%
A+: 0%
O+: 0%
4 types
A- × O+
A+: 56%
A-: 19%
O+: 19%
O-: 6%
8 types
A- × B-
AB-: 56%
A-: 19%
B-: 19%
O-: 6%
AB+: 0%
A+: 0%
B+: 0%
O+: 0%
8 types
A- × B+
AB+: 42%
AB-: 14%
A+: 14%
B+: 14%
A-: 5%
B-: 5%
O+: 5%
O-: 2%
4 types
A- × A-
A-: 94%
O-: 6%
A+: 0%
O+: 0%
4 types
A- × A+
A+: 70%
A-: 23%
O+: 5%
O-: 2%
6 types
A- × AB-
A-: 50%
AB-: 38%
B-: 13%
A+: 0%
AB+: 0%
B+: 0%
6 types
A- × AB+
A+: 38%
AB+: 28%
A-: 13%
AB-: 9%
B+: 9%
B-: 3%
A+
4 types
A+ × O-
A+: 56%
A-: 19%
O+: 19%
O-: 6%
4 types
A+ × O+
A+: 70%
O+: 23%
A-: 5%
O-: 2%
8 types
A+ × B-
AB+: 42%
AB-: 14%
A+: 14%
B+: 14%
A-: 5%
B-: 5%
O+: 5%
O-: 2%
8 types
A+ × B+
AB+: 53%
A+: 18%
B+: 18%
O+: 6%
AB-: 4%
A-: 1%
B-: 1%
O-: 0%
4 types
A+ × A-
A+: 70%
A-: 23%
O+: 5%
O-: 2%
4 types
A+ × A+
A+: 88%
A-: 6%
O+: 6%
O-: 0%
6 types
A+ × AB-
A+: 38%
AB+: 28%
A-: 13%
AB-: 9%
B+: 9%
B-: 3%
6 types
A+ × AB+
A+: 47%
AB+: 35%
B+: 12%
A-: 3%
AB-: 2%
B-: 1%
AB-
4 types
AB- × O-
A-: 50%
B-: 50%
A+: 0%
B+: 0%
4 types
AB- × O+
A+: 38%
B+: 38%
A-: 13%
B-: 13%
6 types
AB- × B-
B-: 50%
AB-: 38%
A-: 13%
AB+: 0%
B+: 0%
A+: 0%
6 types
AB- × B+
B+: 38%
AB+: 28%
B-: 13%
AB-: 9%
A+: 9%
A-: 3%
6 types
AB- × A-
A-: 50%
AB-: 38%
B-: 13%
A+: 0%
AB+: 0%
B+: 0%
6 types
AB- × A+
A+: 38%
AB+: 28%
A-: 13%
AB-: 9%
B+: 9%
B-: 3%
6 types
AB- × AB-
AB-: 50%
A-: 25%
B-: 25%
A+: 0%
AB+: 0%
B+: 0%
6 types
AB- × AB+
AB+: 38%
A+: 19%
B+: 19%
AB-: 13%
A-: 6%
B-: 6%
AB+
4 types
AB+ × O-
A+: 38%
B+: 38%
A-: 13%
B-: 13%
4 types
AB+ × O+
A+: 47%
B+: 47%
A-: 3%
B-: 3%
6 types
AB+ × B-
B+: 38%
AB+: 28%
B-: 13%
AB-: 9%
A+: 9%
A-: 3%
6 types
AB+ × B+
B+: 47%
AB+: 35%
A+: 12%
B-: 3%
AB-: 2%
A-: 1%
6 types
AB+ × A-
A+: 38%
AB+: 28%
A-: 13%
AB-: 9%
B+: 9%
B-: 3%
6 types
AB+ × A+
A+: 47%
AB+: 35%
B+: 12%
A-: 3%
AB-: 2%
B-: 1%
6 types
AB+ × AB-
AB+: 38%
A+: 19%
B+: 19%
AB-: 13%
A-: 6%
B-: 6%
6 types
AB+ × AB+
AB+: 47%
A+: 23%
B+: 23%
AB-: 3%
A-: 2%
B-: 2%
Understanding Blood Type Inheritance
How It Works
Blood type is determined by genes inherited from both parents. Each parent contributes one allele (gene variant) for ABO blood type and one for Rh factor. The combination of these alleles determines a child's blood type.
ABO System
- A and B alleles are co-dominant (both expressed if present)
- O allele is recessive (only expressed if no A or B is present)
- Possible genotypes: AA, AO, BB, BO, AB, OO
Rh Factor
- Positive (+) is dominant
- Negative (-) is recessive
- Two negative parents can only have negative children
- Two positive parents can have either positive or negative children (if both carry the recessive allele)
Key Insights
- Some combinations are impossible (e.g., two O parents cannot have an AB child)
- The same child blood type can result from multiple parent combinations
- Probabilities are based on Mendelian genetics and assume equal chances for each allele
- Rare genetic variations exist but are not covered in this basic chart
Disclaimer: This chart shows theoretical probabilities based on standard Mendelian genetics. Actual inheritance can be affected by rare genetic variants. This tool is for educational purposes only and cannot confirm or exclude paternity. For medical decisions, always consult with a healthcare professional.