What type of genetic abnormality is often sex-linked, so that boys are affected more often than girls?

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Congenital immunodeficiency is a genetic abnormality that is often sex-linked, meaning that it is located on the X chromosome. Since boys have only one X chromosome, they are more likely to be affected by the disorder than girls, who have two X chromosomes. Some examples of congenital immunodeficiencies include X-linked agammaglobulinemia and Wiskott-Aldrich syndrome.

What Type of Genetic Abnormality Is Often Sex-Linked, So That