Blood type are inherited from both parents. The Diagram below shows the rule of inheritance.
The blood type from parents
Father's Blood Type | |||||
A | B | AB | O | ||
Mother's Blood Type |
|||||
A | A/O | A/B/AB/O | A/B/AB | A/O | |
B | A/B/AB/O | B/O | A/B/AB | B/O | |
AB | A/B/AB | A/B/AB | A/B/AB | A/B | |
O | A/O | B/O | A/B | O |