an abnormal condition in which at least one extra X chromosome is present in a male: characterized by reduced or absent sperm production, small testicles, and in some cases enlarged breasts.
Klinefelter syndrome or Klinefelter's syndrome (KS) also known as 47,XXY or
XXY, is the set of symptoms that result from two or more X chromosomes in males
Educational and support information about Klinefelter Syndrome/XXY and its
Klinefelter syndrome is a chromosomal condition that affects male physical and
cognitive development. Its signs and symptoms vary among affected individuals.
By the late 1950s, researchers discovered that men with Klinefelter syndrome
, as this group of symptoms came to be called, had an extra sex chromosome, XXY instead of the usual male arrangement, XY.
In the early 1970s, researchers around the world sought to identify mal... More »
Jun 25, 2013 ... Klinefelter syndrome is a genetic condition that results when a boy is born with an
extra copy of the X chromosome. Klinefelter syndrome is a ...
What is Klinefelter syndrome? Klinefelter syndrome is a condition that occurs in
men as a result of an extra X chromosome. The most common symptom is ...
What is Klinefelter syndrome? Klinefelter syndrome is a genetic disorder that
affects males. Klinefelter syndrome occurs when a boy is born with one or more ...
Jul 1, 2015 ... In 1959, these men with Klinefelter syndrome were discovered to have an extra X
chromosome (genotype XXY) instead of the usual male sex ...
[Note: Much of the medical literature defines Klinefelter syndrome as a person
with an XXY chromosomal arrangement, and considers every XXY individual to ...