Which abnormality is a common sex chromosome defect?
a. Down syndrome
b. Turner syndrome
c. Marfan syndrome
d. Hemophilia
ANS: B
Turner syndrome is caused by an absence of one of the X chromosomes. Down syndrome is caused by trisomy 21 (three copies rather than two copies of chromosome 21). Marfan syndrome is a connective tissue disorder inherited in an autosomal dominant pattern. Hemophilia is a disorder of blood coagulation inherited in an X-linked recessive pattern.
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