Turner syndrome is suspected in an adolescent girl with short stature. What causes this?
a. Absence of one of the X chromosomes
b. Presence of an incomplete Y chromosome
c. Precocious puberty in an otherwise healthy child
d. Excess production of both androgens and estrogens
ANS: A
Turner syndrome is caused by an absence of one of the X chromosomes. Most girls who have this disorder have one X chromosome missing from all cells. No Y chromosome is present in individuals with Turner syndrome. These young women have 45 rather than 46 chromosomes.
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