Often cited as financial desperation or a belief that they were being unfairly excluded from the inheritance. 4. Final Pedigree Verification A correctly drawn pedigree will show
The answer key for the lab activity has been updated. Please download the latest version here: [link] lab activity blood type pedigree mystery answer key upd
| Old Answer Key (Error) | Updated (UPD) Correct Answer | Why the Change | | :--- | :--- | :--- | | "Type AB blood is a universal recipient for antigen transfer." | Type AB is universal recipient for (no antibodies), but NOT for plasma donation. | Clarity on transfusion medicine. | | "Two Type A parents can only have Type A or O children." | Correct, but old keys missed that IAi x IAi yields 25% O. | Many keys forgot the recessive i. | | "Blood type is solely determined by ABO gene." | Updated keys note the H antigen (Bombay phenotype) but state: "Assume standard ABO for this lab." | Prevents advanced students from overcomplicating. | | Pedigree symbols: Used shading for "blood type O." | Use shading only for the trait of interest (e.g., rare allele or disease). For ABO, write genotype inside symbol. | Standardization with NIH pedigree guidelines. | Often cited as financial desperation or a belief