Students use blood type phenotypes in a family pedigree to deduce genotypes, apply codominant inheritance (IA, IB, i), and solve a genetic mystery (e.g., which child belongs to which parent, or if a parent is correctly identified).
Blood Type Pedigree Mystery Analysis | PDF | Genotype - Scribd lab activity blood type pedigree mystery answer key
Blood type is a classic example of a trait determined by genetics. In humans, blood type is determined by the system, which is an example of codominance and multiple alleles . Students use blood type phenotypes in a family
The most common version of this lab features , a wealthy couple in Wexford. Following Joseph's mysterious disappearance, a theft occurs. Evidence found at the scene (often a blood droplet or hair sample) reveals the thief’s traits, such as Type A- blood and attached earlobes . Solving the Pedigree The most common version of this lab features
To solve the mystery, students must apply the following rules of ABO blood type inheritance : The ABO gene has three alleles: IAcap I to the cap A-th power IBcap I to the cap B-th power Codominance: IAcap I to the cap A-th power IBcap I to the cap B-th power are codominant, meaning both are expressed in Type AB ( IAIBcap I to the cap A-th power cap I to the cap B-th power Recessiveness: The allele (Type O) is recessive. A person must have two ) to have Type O blood.
The "Blood Type Pedigree Mystery" is a popular forensic-style lab activity used in biology classrooms to teach Mendelian genetics and pedigree analysis . In this scenario, students act as genetic detectives to solve a crime—often a theft—by tracing the inheritance of blood types and other physical traits like attached earlobes through a family tree. Core Concepts of the Mystery