Which is the genotype of a girl who has hemophlia and sickled cell anemia

A) XhXhss B) XhXHsS C) XHXHss D) XHXHSS

Question

Which is the genotype of a girl who has hemophlia and sickled cell anemia

A) XhXhss     B) XhXHsS   C) XHXHss     D) XHXHSS

BlackTom AI · Accepted Answer

Question restatement: Which is the genotype of a girl who has hemophilia and sickle cell anemia?

Option A: XhXhss
- Hemophilia is X-linked recessive, so a female would express the condition only if she has two copies of the mutant X chromosome (XhXh). This option provides XhXh, which would yield an affected female for hemophilia.
- For sickle cell anemia, the genotype ss indicates homozygous recessive for the sickle cell gene on the autosomes, which would produce the disease. Combining XhXh with ss means the individual would have both conditions expressed.
- Overall, this genotype aligns with a female who is affected by both hemophilia and sickle cell disease.

Option B: XhXHsS
- Here the female has one Xh allele and one XH allele for the X chromosome. XhXHsS would make her a carrier for hemophilia (not affected) because she does not have two copies of the mutated X chromosome.
- For the sickle cell locus, Ss indicates a carrier for sickle cell disease (s is recessive). She would not have full-blown sickle cell anemia, only trait, since Ss is typically a carrier state, not disease.
- Therefore, this combination does not produce an affected female for either condition.

Option C: XHXHss
- The X-linked hemophilia alleles are not present here (XH denotes a normal allele on the X chromosome). Without any Xh alleles, there is no risk of hemophilia, so she would be unaffected for that trait.
- The autosomal ss genotype still produces sickle cell disease, so she would have sickle cell anemia but not hemophilia.
- This option yields a female with sickle cell disease but no hemophilia, which does not match both conditions.

Option D: XHXHSS
- This genotype shows normal alleles on both X chromosomes (no Xh), and the SS genotype on the autosomes indicates no sickle cell disease.
- The absence of both mutant X-linked and autosomal recessive mutations means this individual would be unaffected for both conditions.
- This option clearly does not describe a girl with either hemophilia or sickle cell anemia.

Which is the genotype of a girl who has hemophlia and sickled cell anemia A) XhXhss B) XhXHsS C) XHXHss D) XHXHSS单项选择题

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