Lab Activity Blood Type Pedigree Mystery Answer Key Upd
Before revealing the answer key, we must align on the updated (UPD) genetic rules. The old keys sometimes ignore the cis-AB or Bombay phenotype, but for standard high school level, we stick to the core rules:
| Blood Type (Phenotype) | Possible Genotypes | Antigen on RBC | Antibody in Plasma | | :--- | :--- | :--- | :--- | | A | IAIA or IAi | A antigen | Anti-B | | B | IBIB or IBi | B antigen | Anti-A | | AB | IAIB | A and B antigens | None | | O | ii | None (H antigen only) | Anti-A and Anti-B |
Critical Rule for Pedigrees:
1. Analyze the Father’s Genotype:
2. Analyze the Parents of the Claimant:
3. Perform the Cross for the Claimant:
| | $i$ (Mother) | $i$ (Mother) | | :--- | :---: | :---: | | $I^A$ (Father) | $I^Ai$ (Type A) | $I^Ai$ (Type A) | | $i$ (Father) | $ii$ (Type O) | $ii$ (Type O) | lab activity blood type pedigree mystery answer key upd
4. Interpret the Results: According to the Punnett Square above, the biological children of a Type A (Heterozygous) father and a Type O mother can only be:
5. The Verdict: The Claimant has Type B blood.
Answer Key: Standard pedigree shows Albert (square, B) and Victoria (circle, A) with three children. Child 2 (Louis, circle? or square? depends on gender) marked Type O. Before revealing the answer key, we must align
Before diving into the answer key, let’s reconstruct the typical scenario of this lab.
The Standard Mystery Setup: A wealthy philanthropist has died under suspicious circumstances. The will reveals that a large inheritance is to be split among biological children only. Three individuals come forward claiming to be the long-lost offspring of the deceased. However, the deceased’s known blood type (often Type O or Type AB) and the known blood types of the surviving spouse (or a presumed parent) create a genetic puzzle.
The Evidence:
Your Task: Use your knowledge of ABO genetics (A and B are codominant, O is recessive) to determine which, if any, of the claimants could genuinely be the biological child.