Klinefelter Syndrome
Also known as: XXY male
Genetics/Birth Defects | Men
What is Klinefelter syndrome (KS)?<p>Klinefelter syndrome (KS) is a genetic condition that happens when a male is born with an extra copy of the X chromosome.
KS can affect different stages of physical, language, and social development.
It also usually causes infertility.</p>What causes Klinefelter syndrome (KS)?<p>KS is not inherited.
It's caused by a random error that happens when a sperm or egg is formed.
This error causes a male to be born with an extra X chromosome.</p><p>Chromosomes are tiny "packages" in your cells that contain your genes.
Genes carry information, called DNA, that controls what you look like and how your body works.
Normally, you're born with a set of 46 chromosomes in each cell, two of which are the sex chromosomes.
Females usually have two X chromosomes (XX), and
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