3. A physician is examining the blood types of children from a family. o Child 1 has blood type AB, Child 2 has blood type B, Child 3 has blood type B, and Child 4 has blood type A. o Based on the phenotypes of the children, what are the probable genotypes of the parents?

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Make a punnett square to determine the genotypes and phenotypes that would result for each scenario.
**Topic: Genetics and Blood Types**

**3. Analysis of Blood Types in a Family**

A physician is examining the blood types of children from a family.

- **Child 1** has blood type AB
- **Child 2** has blood type B
- **Child 3** has blood type B
- **Child 4** has blood type A

**Question:** Based on the phenotypes of the children, what are the probable genotypes of the parents?

**Discussion:**

- **Blood Types and Genotypes:**
  - Blood type A can result from genotypes AA or AO.
  - Blood type B can result from genotypes BB or BO.
  - Blood type AB results from genotype AB.
  - Blood type O results from genotype OO.

**Analysis:**

- Child 1’s blood type AB indicates that one parent must provide an A allele and the other a B allele.
- Children 2 and 3’s blood type B could come from either BO or BB genotypes.
- Child 4’s blood type A could come from either AO or AA genotypes.

From this, we can infer that:

- One parent likely has a genotype with an A allele (either AO or AA).
- The other parent likely has a genotype with a B allele (either BO or BB).

This combination would allow for all observed blood types in the children. Consider working out a Punnett square to visualize the potential allele combinations more clearly.
Transcribed Image Text:**Topic: Genetics and Blood Types** **3. Analysis of Blood Types in a Family** A physician is examining the blood types of children from a family. - **Child 1** has blood type AB - **Child 2** has blood type B - **Child 3** has blood type B - **Child 4** has blood type A **Question:** Based on the phenotypes of the children, what are the probable genotypes of the parents? **Discussion:** - **Blood Types and Genotypes:** - Blood type A can result from genotypes AA or AO. - Blood type B can result from genotypes BB or BO. - Blood type AB results from genotype AB. - Blood type O results from genotype OO. **Analysis:** - Child 1’s blood type AB indicates that one parent must provide an A allele and the other a B allele. - Children 2 and 3’s blood type B could come from either BO or BB genotypes. - Child 4’s blood type A could come from either AO or AA genotypes. From this, we can infer that: - One parent likely has a genotype with an A allele (either AO or AA). - The other parent likely has a genotype with a B allele (either BO or BB). This combination would allow for all observed blood types in the children. Consider working out a Punnett square to visualize the potential allele combinations more clearly.
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