Question
3. Alleles for the A and B blood cell antigens are codominant. The condition where no antigens are present on the blood cells (type O blood) is a recessive trait. Which set of parents can most likely produce a child with type O blood? (SC.912.L.16.1)
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1 point
one parent with type AB blood, and the other parent with type A blood
one parent with type AB blood and the other parent with type O blood
one parent with heterozygous type A blood, and the other parent with type O blood
one parent with homozygous type A blood, and the other parent with homozygous type B blood
*
1 point
one parent with type AB blood, and the other parent with type A blood
one parent with type AB blood and the other parent with type O blood
one parent with heterozygous type A blood, and the other parent with type O blood
one parent with homozygous type A blood, and the other parent with homozygous type B blood
Answers
GPT-4o mini
To determine which set of parents can most likely produce a child with type O blood, we need to understand how blood types are inherited.
- **Type A blood** can have the genotype AA or AO.
- **Type B blood** can have the genotype BB or BO.
- **Type AB blood** has the genotype AB.
- **Type O blood** has the genotype OO (which is recessive).
Let’s examine the options:
1. **One parent with type AB blood and the other with type A blood**:
- Possible genotypes: Parent 1 (AB) x Parent 2 (AA or AO). This cannot produce type O blood since an OO genotype is not possible.
2. **One parent with type AB blood and the other with type O blood**:
- Possible genotypes: Parent 1 (AB) x Parent 2 (OO). This cannot produce type O blood since the AB parent can only pass A or B alleles, thus no O allele available.
3. **One parent with heterozygous type A blood (AO) and the other parent with type O blood (OO)**:
- Possible genotypes: Parent 1 (AO) x Parent 2 (OO). This can produce offspring of genotypes AO (type A) and OO (type O). Thus, it is possible for them to have a child with type O blood.
4. **One parent with homozygous type A blood (AA) and the other with homozygous type B blood (BB)**:
- Possible genotypes: Parent 1 (AA) x Parent 2 (BB). This cannot produce type O blood since all offspring will be AB.
The only set of parents that can most likely produce a child with type O blood is:
**One parent with heterozygous type A blood (AO), and the other parent with type O blood (OO).**
- **Type A blood** can have the genotype AA or AO.
- **Type B blood** can have the genotype BB or BO.
- **Type AB blood** has the genotype AB.
- **Type O blood** has the genotype OO (which is recessive).
Let’s examine the options:
1. **One parent with type AB blood and the other with type A blood**:
- Possible genotypes: Parent 1 (AB) x Parent 2 (AA or AO). This cannot produce type O blood since an OO genotype is not possible.
2. **One parent with type AB blood and the other with type O blood**:
- Possible genotypes: Parent 1 (AB) x Parent 2 (OO). This cannot produce type O blood since the AB parent can only pass A or B alleles, thus no O allele available.
3. **One parent with heterozygous type A blood (AO) and the other parent with type O blood (OO)**:
- Possible genotypes: Parent 1 (AO) x Parent 2 (OO). This can produce offspring of genotypes AO (type A) and OO (type O). Thus, it is possible for them to have a child with type O blood.
4. **One parent with homozygous type A blood (AA) and the other with homozygous type B blood (BB)**:
- Possible genotypes: Parent 1 (AA) x Parent 2 (BB). This cannot produce type O blood since all offspring will be AB.
The only set of parents that can most likely produce a child with type O blood is:
**One parent with heterozygous type A blood (AO), and the other parent with type O blood (OO).**