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] …

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 have …

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

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). …

About 1 in every 1,000 boys is born with XYY syndrome. Boys with XYY syndrome tend to be tall and have difficulties with language. Their intelligence quotient (IQ) tends to be slightly lower than that of …

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.

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 …

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 database in detail? …

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 …