Jacob syndrome or also known as XYY syndrome is found in about 1 in 1000 boys. Most people have 46 chromosomes in each cell. In men, this usually includes one X chromosome and one Y chromosome (XY).

The skeleton with an extra Y chromosome also showed osteological evidence consistent with Jacobs syndrome (male, 46+ years, dated 680 to 890 CE); ...

Jacobs syndrome is not genetic, though the exact reasons for the chromosomal misfire are unclear. It appears to be somewhat random, resulting from flaws in the cell division process of the Y ...

The syndrome is commonly known as Jacob’s syndrome, Superman syndrome, XYY karyotype, XYY syndrome, YY syndrome, and 46,XY/47,XYY mosaicism.

Men with an extra X chromosome, known as Klinefelter syndrome, or Y chromosome, also known as Jacobs syndrome, have an increased risk of delayed development, learning disabilities, type 2 diabetes ...

For example, 47,XYY syndrome, also known as Jacobs syndrome, is associated with above-average height and an increased risk of learning disabilities. Another example, ...

A young man who graduated from Grain Valley High School – with a flame thrower for a right arm and a head full of dreams – is ...

Prenatal aneuploidy screening through Juno Hazel™ Plus offers an expected >99% sensitivity and >99.9% specificity for Trisomy 21 (Down syndrome), Trisomy 18 (Edwards syndrome), Trisomy 13 (Patau ...

Men with an extra X chromosome, known as Klinefelter syndrome, or Y chromosome, also known as Jacobs syndrome, have an increased risk of delayed development, learning disabilities, type 2 diabetes ...

StatPearls, "Jacobs Syndrome," Sept. 10, 2024 The Washington Post, " Trump says there are ‘two sexes.’ Experts and science say it’s not binary ," Feb. 19, 2025 ...