: Participants draw a family tree using standard symbols (squares for males, circles for females) and Roman numerals for generations .
An AB parent can never have an O child, and an O parent can never have an AB child.
Teacher Note: Ensure students chart out the intermediate parent's genotype as IAicap I to the cap A-th power i IBicap I to the cap B-th power i to prove the claim is valid. Part 5: Teacher Tips for Grading and Implementation
Check that students write genotypes with proper superscript notation ( IAcap I to the cap A-th power IBcap I to the cap B-th power ). Dropping the "I" is a common error.
The mystery is solved by identifying the individual whose genotype allows for both Type A blood and attached earlobes. Pedigree Chart diagram to help visualize the family's inheritance? lab activity blood type pedigree mystery answer key upd
Blood Type Pedigree Mystery lab, the primary goal is to identify a "thief" by analyzing the inheritance patterns of the ABO blood group and other physical traits, such as earlobe attachment. ✅ Lab Conclusion & Answer Key The thief is typically identified as (though some variations may name Course Hero Thief's Identity: The blood found at the crime scene was , and the thief was observed to have attached earlobes matches both traits
allele. If they have a Type B child and Rita is AB, Joseph must provide either an cap I to the cap B-th power Joseph's Typical Result: , Genotype cap I to the cap B-th power i Course Hero 4. Match Suspects to the Crime Scene
To solve the mystery, students must first understand the genetic rules governing blood types. Unlike simple dominant-recessive traits, the ABO system involves and codominance . Genetics of blood type: inheritance and compatibility
Since Joseph’s specific genotype is often a "mystery" in the lab, use his children’s blood types to deduce it. If Rita is Type AB ( cap I to the cap A-th power cap I to the cap B-th power ) and they have a child who is Type O ( : Participants draw a family tree using standard
In rare clinical cases, individuals may possess the genes for Type A, B, or AB blood but test as Type O. This is known as the Bombay Phenotype. It occurs when a person lacks the H substance , a foundational molecular structure required for A and B antigens to attach to red blood cells. In advanced lab activities, this serves as an excellent example of epistasis.
(Type B). : A Type AB parent and a Type O parent can never produce a Type O or a Type AB child. Rh Factor: Because Mrs. Davis is , she can only pass on a recessive Child Match : Child 3 (Type B+) .
When grading this lab activity, look out for these frequent student errors:
of the recessive Rh- allele. They have a 25% chance of having an Rh- Teacher Tips for Grading Part 5: Teacher Tips for Grading and Implementation
How does codominance differ from traditional dominant/recessive traits? Common Student Misconceptions Thinking Type AB parents can have Type O children. Correction: Remind students an AB parent has no Mistake: Assuming Type A always means a genotype of IAIAcap I to the cap A-th power cap I to the cap A-th power
The following table summarizes the key family members and their traits used to narrow down the thief: Blood Type Earlobe Trait Genotype (Blood/Lobe) Father/Grandfather cap I to the cap B-th power i Mother/Grandmother cap I to the cap A-th power cap I to the cap B-th power cap I to the cap A-th power i Granddaughter cap I to the cap A-th power i 4. Solve the mystery The crime scene evidence consists of Type A- blood attached earlobes Course Hero Suspect Identification
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