Pedigree Chart X linked Recessive Disorders

Characteristics of Sex (X) linked Recessive Trait

• More  males than  females are affected.
• Affected sons are usually born to unaffected mother; thus  the trait skip generations.
• A carrier( heterozygous) mother produces approximately 1/2 affected sons.
• Is never passed from father to son.
• All daughters of affected fathers are carriers.

Examples of Sex linked Recessive Disorder