Why is hemophilia a sex-linked trait?

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Hemophilia is a sex-linked trait because it is carried on the X chromosome, which is part of the 23rd chromosome pair that determines sex. Males have one X and one Y chromosome (XY), while females have two X chromosomes (XX). Since hemophilia is linked to the X chromosome, males are more likely to express the disease with just one affected X chromosome, while females, having two X chromosomes, are less likely to express the disease unless both X chromosomes carry the mutation.

Why Is Hemophilia a Sex-Linked Trait