X

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

XX Disorder - Otherwise known as sex reversal syndrome -- a variant form of Klinefelter's syndrome. Although affected men have a normal number of chromosomes (46), the sex chromosome signature is "XX," with a displacement of the Y chromosome somewhere within the other pairs of somatic (bodily) genes. The signs of XX disorder are comparable to those of Klinefelter's syndrome, yet most individuals are short in stature are less likely to be mentally deficient, and may exhibit hypospadias (underside opening of the urethra in the glands penis).

XYY Syndrome - XYY syndrome has more a variable physical expression than other genetic abnormalities. Indeed, no consistent syndrome has yet been defined, since XYY men may suffer from abnormalities like seminiferous tubule sclerosis, or they may present with normal gonads. In general, though, men with XYY syndrome are extremely tall, and they may suffer from a pustular form of acne. Some individuals express antisocial behavior. Ejaculate samples from XYY men vary between azoospermia (no sperm) and normal sperm counts. Blood and urinary levels of testosterone, luteinizing hormone (LH), and follicle-stimulating hormone (FSH) often are normal; abnormalities in these hormone levels are related to the extent of germ cell damage within the testes.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

XX Disorder - Otherwise known as sex reversal syndrome -- a variant form of Klinefelter's syndrome. Although affected men have a normal number of chromosomes (46), the sex chromosome signature is "XX," with a displacement of the Y chromosome somewhere within the other pairs of somatic (bodily) genes. The signs of XX disorder are comparable to those of Klinefelter's syndrome, yet most individuals are short in stature are less likely to be mentally deficient, and may exhibit hypospadias (underside opening of the urethra in the glands penis).
XYY Syndrome - XYY syndrome has more a variable physical expression than other genetic abnormalities. Indeed, no consistent syndrome has yet been defined, since XYY men may suffer from abnormalities like seminiferous tubule sclerosis, or they may present with normal gonads. In general, though, men with XYY syndrome are extremely tall, and they may suffer from a pustular form of acne. Some individuals express antisocial behavior. Ejaculate samples from XYY men vary between azoospermia (no sperm) and normal sperm counts. Blood and urinary levels of testosterone, luteinizing hormone (LH), and follicle-stimulating hormone (FSH) often are normal; abnormalities in these hormone levels are related to the extent of germ cell damage within the testes.