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 …

Two of the 46 chromosomes, known as X and Y, are called sex chromosomes because they help determine whether a person will develop male or female sex characteristics. Females typically …

Dec 5, 2024 · 47,XYY syndrome (Jacobs syndrome) is a rare condition in which males have an additional Y chromosome in their genetic code.

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 …

XYY Syndrome - Learn about the causes, symptoms, diagnosis & treatment from the Merck Manuals - Medical Consumer Version.

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?

The 47,XYY syndrome occurs in approximately 1/1000 live male births. Affected boys tend to be taller than average and have a 10- to 15-point IQ reduction compared with family members.

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

Oct 3, 2012 · Search for detailed information on rare diseases, including NORD's authoritative Rare Disease Reports and data from other reliable sources. Interested in exploring the …

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 …