XYY syndrome - First case

XYY syndrome is a aneuploidy of the sex chromosomes in which a human male receives an extra Y chromosome in each cell, hence having a karyotype of 47,XYY. XYY syndrome is also called Jacob's Syndrome, XYY-trisomy, 47,XYY aneuploidy, or Supermale syndrome. XYY syndrome - First case. The first published report of a man with a 47,XYY chromosome constitution was by Dr. Avery A. Sandberg, et al. of Buffalo, New York in 1961. It was an incidental finding in a normal 44-year-old, ...

Including:

• XYY syndrome - First case
• XYY syndrome - Effects
• XYY syndrome - Physical traits
• XYY syndrome - Behavioral characteristics
• XYY syndrome - Cause and prevalence

Read more here: » XYY syndrome: Encyclopedia - XYY syndrome

XYY syndrome - Physical traits. XYY syndrome typically causes no unusual physical features or medical problems. Males with this syndrome may be slightly taller than average and are typically a few centimeters taller than their father and siblings. Skeletal malformations may also accompany XYY syndrome at a higher rate than in the general population. Severe facial acne has occasionally been reported, but dermatologists specializing in acne (Plewig & Kligman, 2000) now doubt the existence of a relationsh ...

See also:

XYY syndrome, XYY syndrome - First case, XYY syndrome - Effects, XYY syndrome - Physical traits, XYY syndrome - Behavioral characteristics, XYY syndrome - Cause and prevalence

Read more here: » XYY syndrome: Encyclopedia II - XYY syndrome - Effects

XYY syndrome is not inherited, but usually occurs as a random event during the formation of sperm cells. An error in cell division called nondisjunction can result in sperm cells with an extra copy of the Y chromosome. If one of these atypical reproductive cells contributes to the genetic makeup of a child, the child will have an extra Y chromosome in each of the body's cells. In some cases, the addition of an extra Y chromosome occurs as an accident during cell division in early fetal development. The incidence ...

See also:

XYY syndrome, XYY syndrome - First case, XYY syndrome - Effects, XYY syndrome - Physical traits, XYY syndrome - Behavioral characteristics, XYY syndrome - Cause and prevalence

Read more here: » XYY syndrome: Encyclopedia II - XYY syndrome - Cause and prevalence