Therefore, if these are the only two babies, an error occurred in the lab prompts, or Baby X must belong to the Smiths (
. Fiona is a legitimate biological child of David and Grace. Case 2: Charles (The Claimant)
Note: There are dozens of versions of this lab on Teachers Pay Teachers, Lab-Aids, and Flinn Scientific. The following is based on the most common 2023-2024 "UPD" (Updated) version circulating in high school biology curricula. lab activity blood type pedigree mystery answer key upd
To arrive at the correct answer key, students must recall three core principles:
Understanding how blood types are inherited is a fundamental concept in genetics. A blood type pedigree lab activity allows students to apply their knowledge of multiple alleles, codominance, and autosomal recessive inheritance to solve a realistic family mystery. Therefore, if these are the only two babies,
Medical records of the family's blood types have been recovered. Students must reconstruct the pedigree chart, fill in the missing genotypes, and determine if Charles is genetically linked to the family. The Recovered Medical Data Arthur Pendelton (Grandfather - Deceased): Type AB Eleanor Pendelton (Grandmother): Type O Generation II (Children & Spouses): Beatrice (Arthur & Eleanor's Daughter - Deceased): Type A Edward (Beatrice’s Husband): Type B David (Arthur & Eleanor's Son): Type B Grace (David’s Wife): Type A Generation III (Grandchildren):
Two families (The Smiths and The Joneses) have babies (Baby X and Baby Y) born on the same night. The tags are lost. The Smiths: Parents are Type O and Type AB. The Joneses: Parents are Type A and Type B. The Babies: One is Type O, one is Type AB. Who belongs to whom? 2. Updated Answer Key and Explanations The following is based on the most common
We already determined the Jones family cannot have an AB child.
Baby 1 (Type O) must belong to Family Smith. 2. Analyzing Family Jones Parental Phenotypes: Mother (Type A) x Father (Type AB) Parental Genotypes: Mother ( IAIAcap I to the cap A-th power cap I to the cap A-th power IAicap I to the cap A-th power i ) x Father ( IAIBcap I to the cap A-th power cap I to the cap B-th power