Lab Activity Blood Type Pedigree Mystery Answer Key Upd Fixed Jun 2026

Do not try to guess by looking at the pedigree.

Use Google Slides or Jamboard. Give each student a drag-and-drop pedigree where they must place the correct genotype (AA, AO, BB, BO, AB, OO) inside each symbol.

Autosomal recessive; two parents with free lobes can have a child with attached lobes if both are heterozygous ( Joseph's Blood Type? with the genotype cap I to the cap B-th power i , determined by the presence of a child with an Universal Donor/Recipient? (no antigens). Recipient: (no antibodies). lab activity blood type pedigree mystery answer key upd

Searching for is a starting point, not a final destination. The real value of this lab is the cognitive process: using exclusion logic, understanding codominance, and reading a family tree like a detective.

Reasoning : Child 3 is the only child with Type B blood. Mr. Davis passed the IBcap I to the cap B-th power allele, Mrs. Davis passed the allele, and Mr. Davis passed the dominant allele for the Rh factor. 2. The Jones Family Investigation : Mr. David Jones (Type O+) Mrs. Karen Jones (Type A-) Parental Genotypes : (Rh status IAicap I to the cap A-th power i IAIAcap I to the cap A-th power cap I to the cap A-th power Possible Offspring Genotypes : ABO: If Mrs. Jones is heterozygous ( IAicap I to the cap A-th power i ), they can have Type A ( IAicap I to the cap A-th power i ) or Type O ( ) children. Rh Factor: Because Mrs. Jones is Rh- ( ), any offspring must receive at least one recessive allele. If Mr. Jones is heterozygous ( ), they can have Rh- ( ) children. Child Match : Child 1 (Type O-) . Reasoning : Child 1 has the genotype Do not try to guess by looking at the pedigree

Watch out for students who assume that because Arthur (AB) has no "O" alleles, none of his descendants can have Type O blood. Remind them to look at the spouses married into the family (Generation II) and Eleanor (I-2), who introduces the recessive allele into the gene pool.

Students often assume that because Type A and Type B are dominant, a parent with Type AB cannot have a child with Type O. Remind them to look at the spouse's genotype; an AB parent can easily have a Type A or Type B child with an O-type spouse because the O parent provides the hidden recessive Autosomal recessive; two parents with free lobes can

) in generation 3, both parents in generation 2 MUST carry the allele, even if they are Phenotype A or B. 3. Key Genetics Concepts Used To get the right answer, you must master these concepts: The ABO gene has three alleles: Codominance: IAcap I to the cap A-th power IBcap I to the cap B-th power are codominant. If you have both, you are Type AB. Recessive: is recessive. You need to be Type O. Genotype vs. Phenotype: Type A can be IAIAcap I to the cap A-th power cap I to the cap A-th power (homozygous) or IAicap I to the cap A-th power i

: For the Claimant to have Type O blood ( ), they must have inherited one recessive allele from their mother and one from their father.