Hemophilia is a sex-linked disorder. Males who receive the allele are always affected. Females are affected only 25% of the time. Which kind of inheritance must hemophilia display and why?(1 point) Responses Y-linked recessive because the males that receive the allele sometimes have hemophilia. Y-linked recessive because the males that receive the allele sometimes have hemophilia. Y-linked dominant because all males with the allele have hemophilia. Y-linked dominant because all males with the allele have hemophilia. X-linked recessive because all males with the allele have hemophilia, and only some females if they receive two recessive alleles. X-linked recessive because all males with the allele have hemophilia, and only some females if they receive two recessive alleles. X-linked dominant because everyone with the allele has hemophilia. X-linked dominant because everyone with the allele has hemophilia.

Select One

1 answer

The correct response is: X-linked recessive because all males with the allele have hemophilia, and only some females if they receive two recessive alleles.

Explanation:

  • Hemophilia is caused by mutations in genes located on the X chromosome.
  • Males (XY) have only one X chromosome, so if they inherit the allele for hemophilia from their mother (who has two X chromosomes), they will express the disease.
  • Females (XX) have two X chromosomes and typically need to inherit two copies of the hemophilia allele (one from each parent) in order to be affected, which is why they are affected less frequently than males. This pattern of inheritance is characteristic of X-linked recessive disorders.