Which syndrome is defined by the presence of two X chromosomes and a Y chromosome in each cell?

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Multiple Choice

Which syndrome is defined by the presence of two X chromosomes and a Y chromosome in each cell?

This item hinges on matching a chromosomal pattern to a specific syndrome. When a person has two X chromosomes and one Y chromosome in every cell, the karyotype is XXY. That pattern defines Klinefelter syndrome, a condition that affects males and often includes features like reduced fertility and signs of hypogonadism, with possible tall stature and learning differences. The other syndromes arise from different chromosomal configurations: Down syndrome is caused by an extra chromosome 21, Turner syndrome by a missing X (monosomy X), and Triple X syndrome by an extra X (XXX) in females. So the description given points to Klinefelter syndrome.

This item hinges on matching a chromosomal pattern to a specific syndrome. When a person has two X chromosomes and one Y chromosome in every cell, the karyotype is XXY. That pattern defines Klinefelter syndrome, a condition that affects males and often includes features like reduced fertility and signs of hypogonadism, with possible tall stature and learning differences. The other syndromes arise from different chromosomal configurations: Down syndrome is caused by an extra chromosome 21, Turner syndrome by a missing X (monosomy X), and Triple X syndrome by an extra X (XXX) in females. So the description given points to Klinefelter syndrome.

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