Which can be directly attributed to a single-gene disorder? (Select all that apply.)
a. Cleft lip
b. Cystic fibrosis
c. Turner syndrome
d. Klinefelter syndrome
e. Neurofibromatosis
ANS: B, E
Cystic fibrosis is a single-gene disorder inherited as an autosomal recessive trait, and neurofibromatosis is a single-gene disorder inherited as an autosomal dominant trait. Cleft lip is classified as a multifactorial disorder in which a genetic susceptibility and appropriate environment appear to play important roles. Turner and Klinefelter syndromes are disorders of sex chromosome number.
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