The is a popular forensic science and biology exercise designed to teach students the complexities of ABO blood group inheritance and pedigree analysis . Often featuring a scenario involving a wealthy couple—frequently named Joseph and Rita —this activity requires students to identify a "thief" or solve a family inheritance dispute by tracing blood types across multiple generations. Core Concepts of Blood Type Inheritance

The servant claimed O is impossible. The servant is wrong – but wait, the lab says "Keep reading... the royal bloodline historically has never produced O."

Uses codominance (A and B are both expressed) and multiple alleles ( ). Type O is recessive.

Blood Type Pedigree Mystery Analysis | PDF | Genotype - Scribd