To solve the mystery, one must first understand the genetics of the ABO blood group system.
To help you update your own lab manual, here is a clean answer key format for the most likely questions:
Q1: Draw the pedigree for a family where Mom is Type A (heterozygous), Dad is Type O. They have 3 children: Type A, Type O, and Type A.
A1: (Diagram: circle Mom (IAi), square Dad (ii). Children: circle (IAi), square (ii), circle (IAi).)
Q2: Could a Type AB father and a Type A mother have a Type O son? Explain.
A2: No. Type AB father (IAIB) has no i allele to pass. Type O requires genotype ii. Therefore impossible.
Q3: In the "Hospital Mix-Up" version:
If Victoria is IAIA, she can only pass an IA allele. For Louis to be Type O (ii), he must receive i from father and i from mother. But mother has no i. Contradiction. Unless: lab activity blood type pedigree mystery answer key upd
Final Answer Key Box:
Conclusion: Prince Louis is not the biological offspring of Queen Victoria and King Albert. The pedigree shows a non-paternity event or hospital mix-up. The true parents of a Type O child must both carry an i allele. Since Victoria is IAIA, Louis must belong to another family.
In a classic “Blood Type Pedigree Mystery,” students are presented with a scenario. For example: A wealthy individual has died without a will. Several claimants appear, each asserting they are the long-lost child of the deceased. The only biological evidence available is a pedigree chart showing the blood types of the deceased (now deceased, so no direct sample), the deceased’s known parents, a surviving spouse, and the claimants. Students must analyze which claimants could be biological children based on possible parental genotype combinations.
An updated version of the lab might include a twist: a hospital baby-switching subplot, a disputed paternity case, or a historical mystery (e.g., the Romanov family). The “answer key” provides the logical steps to solve the mystery, not just final blood types.
Show a 2-minute news clip about a real paternity case solved via ABO typing (pre-DNA era). Discuss why courts no longer rely solely on blood type – because it can only exclude, not prove guilt. To solve the mystery, one must first understand
The Royal Family of Veridian:
The key clues were the O child (both parents must carry i) and the AB child (parents provide IA and IB), plus Rh− children requiring both parents to carry d. Combining ABO and Rh inheritance pinpoints the mystery individual as genotype IAi, dd (phenotype A−).
Blood Type Pedigree Mystery lab, students use the ABO blood group system
to solve a "whodunnit" scenario. The activity typically centers on a family—often featuring a wealthy couple named Joseph and Rita—to identify a thief among their potential blood relatives. Course Hero The primary answer to this lab mystery is that the thief is Shayla , who is identified because her A+ blood type attached earlobes match the evidence found at the crime scene. Course Hero 1. Identify inheritance patterns
Before solving the pedigree, you must establish the rules for the two traits being tracked: Blood Type: Follows a codominant and multiple-allele pattern. Alleles cap I to the cap A-th power cap I to the cap B-th power are codominant, while (Type O) is recessive. Usually presented as a simple Mendelian trait where detached earlobes (E) are dominant and attached earlobes (e) are recessive. Course Hero 2. Map the family pedigree Construct the family tree by placing and Rita at the top (Generation I). Joseph’s Type: If Victoria is IAIA, she can only pass an IA allele
Often must be "worked backward" from his children. In many versions, is determined to be cap I to the cap A-th power i Children/Grandchildren:
List their phenotypes (A, B, AB, or O) and use Punnett squares to deduce their specific genotypes based on what they could have inherited from their parents. Course Hero 3. Analyze crime scene evidence The mystery provides two key pieces of forensic evidence: Blood Sample:
Found at the scene, identifying the perpetrator's blood type (e.g., Physical Trait: A description or biological sample indicating attached earlobes Course Hero 4. Cross-reference suspects
By comparing the genotypes of every family member in the pedigree against the evidence, you can eliminate suspects: Elimination:
Any relative with Type B, Type AB, or Type O blood is excluded if the evidence is Type A. Final Identification:
is the only relative whose blood type and earlobe trait both align with the evidence. Course Hero Answer Summary The answer key identifies the thief as
. She is the culprit because her phenotype (Type A+ blood and attached earlobes) is genetically consistent with the evidence collected, and her potential motive often involves feelings of being excluded from the family's inheritance. Course Hero showing the probability of and Rita's children having Type A blood? Blood Type Pedigree Mystery Lab Activity - TPT