Blood Type Pedigree Mystery
The is an educational lab activity—often found on platforms like TPT and Course Hero —where students solve a theft using genetics. Key Features of the Activity
- Type A: $I^AI^A$ (Homozygous) or $I^Ai$ (Heterozygous)
- Type B: $I^BI^B$ (Homozygous) or $I^Bi$ (Heterozygous)
- Type AB: $I^AI^B$
- Type O: $ii$
The "Mystery" element
usually hides the direct answer. Instead of a simple Punnett square, students must trace the inheritance of the ABO gene (chromosome 9) across three generations.
Critical Rule for Pedigrees:
Check Baby 2:
If Baby 2 is Type AB, look for the couple where neither parent is Type O. Scenario B: The Inheritance Mystery (Grandparents)
Create a pedigree for a fictional family with a mystery trait. Use genetic principles to determine the genotypes and phenotypes of each family member. Share your pedigree with the class and see if they can solve the mystery!
