A baby girl is born with hemophilia which is an X-linked recessive disorder. What are the most likely genotypes of her parents?
- The mother is normal and the father is normal.
- The mother is hemophiliac and the father is normal.
- The mother is carrier and the father is hemophiliac.
- Both are normal
Explanation
The most likely genotypes of the parents of a baby girl with hemophilia are that the mother is a carrier and the father is a hemophiliac..
Hemophilia is X-linked recessive:
This means the gene for hemophilia is located on the X chromosome, and a female needs both copies of the recessive gene to express the disorder.
Male genotype:
Males have only one X chromosome, so if they inherit the hemophilia gene, they will have the disease.
Female genotype:
Females have two X chromosomes. If they inherit one copy of the hemophilia gene and one copy of the normal gene, they will be carriers but won't have the disease.
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