How is blood type inherited? And do exceptions ever happen?
Genes and Blood Type - University of Utah
Genetics of blood type: inheritance and compatibility
Blood Types Explained - A, B, AB and O | Red Cross Blood Services
Blood Type Heredity - Biology Dictionary
Understanding Relationships: A Detailed Look at the Chart of Blood Types
Blood Type Genetics | Definition & Punnett Square Examples
Blood Type Calculator
The Genetics of Blood Types - Relevant Genetics
The Mystery of Human Blood Types | Smithsonian