Question at position 6 A many with type A blood produces offspring with a woman with type O blood. What are all the possible blood types of their children? (Check all that apply.)ABABOBlackTom题目解析

Question

Question at position 6 A many with type A blood produces offspring with a woman with type O blood. What are all the possible blood types of their children? (Check all that apply.)ABABOBlackTom题目解析

BlackTom AI · Accepted Answer

We start by identifying the parental blood types: father is type A and mother is type O.
Mother: type O means genotype OO (no A or B alleles).
Father: type A could be either genotype AA or AO (two common possibilities).
Now, perform the Punnett square reasoning for each case:
- Case 1: Father is AA × Mother OO
  - The father's gametes: A, A; mother's gametes: O, O.
  - Offspring genotypes: AO, AO, AO, AO → all children would be type A.
  - Therefore, with father AA, type O offspring would not occur.
- Case 2: Father is AO × Mother OO
  - The father's gametes: A, O; mother's gametes: O, O.
  - Offspring genotypes: AO (A) and OO (O) in equal likelihood.
  - Therefore, possible blood types are A or O for the children.
Next, assess the listed answer options:
- AB: This would require an offspring with both A and B alleles, which cannot arise from an A × O cross because the mother has no B allele to pass, and the father can contribute at most A or O. Hence AB is impossible.
- A: As shown in Case 2, A is indeed possible when the father contributes A and the mother contributes O.
- B: For the B blood type to occur, the father would need a B allele to pass; since the mother is OO and cannot contribute B, and the father’s A genotype does not guarantee a B allele, B cannot occur in this cross.
- O: O is possible only in the scenario where the father contributes O and the mother contributes O. Since the mother is OO, this is achievable if the father is AO, making OO offspring possible. Thus O is a valid outcome.
In summary, AB and B are not possible given an A × O cross, while A and O are possible outcomes depending on whether the father is AO (which allows O offspring) or AA (which does not). The provided correct selections A and O align with the scenario where the father is AO.

Question at position 6 A many with type A blood produces offspring with a woman with type O blood. What are all the possible blood types of their children? (Check all that apply.)ABABOBlackTom题目解析

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