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The only possible blood types for their biological children are Type A or Type B . Type O and Type AB are impossible.

Start by translating the phenotypes (blood types and ear shapes) into genotypes where possible.

Your mission is to create a pedigree (a family tree) for Joseph and Rita's family, map out the blood types and earlobe traits for all potential suspects, and use genetic principles to identify the culprit.

The possible genotypes and phenotypes for ABO blood type are:

Probability=12 (Type B)×12 (Rh-)=14=25%Probability equals one-half space open paren Type B close paren cross one-half space open paren Rh- close paren equals one-fourth equals 25 % Part 3: Common Student Misconceptions & Troubleshooting

Every year, biology teachers face the same challenge: how to make Mendelian genetics and immunology engaging without resorting to rote memorization. Enter the . This hands-on simulation combines the logic of a "whodunit" mystery with the rigorous science of ABO blood typing and pedigree analysis.

To help adapt this answer key to your specific classroom materials, tell me:

The most common version of this activity is the "Mystery in Wexford." Here's the scenario: