Melissa has a single X chromosome and no Y chromosome, an immature female appearance, and lacks internal reproductive organs. What is the most appropriate diagnosis of her condition?
A) Down syndrome
B) Turner's syndrome
C) Fragile X syndrome
D) Klinefelter's syndrome

Question

Quizplus · Accepted Answer

Turner syndrome occurs in about 1 of 10,000 females. One of the X chromosomes is either missing or inactive. The characteristics of Turner syndrome match Melissa's: Individuals with Turner syndrome usually have an immature female appearance-they do not develop secondary sex characteristics. They also lack internal reproductive organs. These females may be abnormally short, and some are mentally retarded. The disorder is usually discovered at puberty, and hormone replacement therapy can help with a more normal appearance.

Melissa Has a Single X Chromosome and No Y Chromosome