What happens when a man has an extra X chromosome?
What happens when a man has an extra X chromosome?
Klinefelter syndrome is caused by an additional X chromosome. This chromosome carries extra copies of genes, which interfere with the development of the testicles and mean they produce less testosterone (male sex hormone) than usual.
Can a man have an extra X chromosome?
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 genetic condition affecting males, and it often isn’t diagnosed until adulthood.
How common is XXY male syndrome?
Affected Populations. 47, XXY (KS) is the most common human sex chromosome disorder and occurs in approximately 1 in 500-1,000 males.
How long can a person live with Klinefelter’s syndrome?
Prognosis for Klinefelter Syndrome In general, life expectancy is normal. Some research has found that life expectancy for men with the condition may be a year or two less than those without it because of other health problems linked to Klinefelter.
What is an XXY baby?
Boys who have Klinefelter syndrome are born with it. It’s also called XXY because they have an extra X chromosome in most or all their cells. Usually, a person has 46 chromosomes in each cell, divided into 23 pairs, which includes two sex chromosomes.
Does Klinefelter syndrome affect IQ?
Research has shown that the average intelligence (sometimes known as IQ) of boys with Klinefelter Syndrome is lower than that of boys with the usual number of chromosomes. In one study, the average IQ score was 98 for boys with Klinefelter compared with a value of 112 in the other boys.
Is Klinefelter’s a disability?
Most males with the 47,XXY karyotype have normal intelligence. Intellectual disability occurs in males with Klinefelter syndrome variants, who have a higher number of X chromosomes. About 70% of patients have minor developmental and learning disabilities.
