XYY syndrome, also known as Jacobs syndrome and Superman syndrome, is an aneuploid genetic condition in which a male has an extra Y chromosome. [1] There are usually few symptoms. [2] …

Dec 5, 2024 · What is 47,XYY syndrome (Jacobs syndrome)? 47,XYY syndrome (or what used to be called Jacobs syndrome) is a condition in which males have an additional Y chromosome in their …

Oct 3, 2012 · Learn about XYY Syndrome, including symptoms, causes, and treatments. If you or a loved one is affected by this condition, visit NORD to find resources and.

Sep 10, 2024 · Jacobs syndrome, also known as 47,XYY syndrome, is a rare genetic condition that occurs in about 1 out of 1000 male children; this condition belongs to a group of conditions known as …

Feb 4, 2025 · What is XYY syndrome? XYY syndrome, also known as Jacobs syndrome, is a chromosomal disorder characterized by the presence of an extra Y chromosome (47, XYY). …

How do we know about XYY? If most boys and men with XYY are never diagnosed, how do we know about the impact of the extra Y chromosome?

47,XYY syndrome is characterized by an extra copy of the Y chromosome in each of an individual's cells. Although many people with this condition are taller than average, the chromosomal change …

XYY syndrome is a sex chromosome abnormality in which boys are born with two Y chromosomes and one X chromosome. Chromosomes are structures within cells that contain DNA and many genes.

Feb 19, 2025 · XYY syndrome is a rare genetic condition that occurs in males, only when they are born with an additional Y chromosome in most or all of their cells. This means that instead of one X …

Boys typically have one X chromosome and one Y chromosome, or XY, but boys with XYY syndrome have an extra Y chromosome, or XYY. XYY syndrome is not caused by anything the parents did or …