It can affect physical and mental development. Tests that may be ordered include What Is XYY Syndrome? Many boys and men do not realise they have it. Aggressive and violent tendencies do not occur consistently in supermales for it to be a proven … Boys with XYY syndrome — also known as 47,XYY — might be taller than other boys. Conducted a genetic examination of the father of a child with Down syndrome. Other signs and symptoms of this condition include hand tremors or other involuntary movements (motor tics), … XYY syndrome is a rare chromosomal disorder that affects males with an incidence of 1 in 1000 males, characterized by having an additional Y chromosome (47,XYY). Genes contain instructions that … Common symptoms reported by people with XYY syndrome. Furthermore, signs and symptoms of 47 XYY syndrome may vary on an individual basis for each patient. Originally, supermales were thought to be extra aggressive, even to the point of being violent, but this has since been disproven. XYY syndrome is a genetic condition found in males only. XYY boys grow taller than average, they have a 'growth spurt' during childhood which results in an average height of 6 foot, 2 inches. XYY syndrome is a congenital chromosomal pathology that affects only men. Affected individuals are usually very tall. The main effect of this is to disrupt male sexual development. In some cases, boys during their infant or teenage state show certain symptoms that vary from person to person. Chromosomes are structures within cells that contain DNA and many genes. This condition affects 1 in 18,000 to 50,000 boys. About 1 in 1,000 boys have it. In Edinburgh, Scotland, eight 47,XYY boys born 1967–1972 and identified … Klinefelter syndrome may adversely affect testicular growth, resulting in smaller than normal testicles, which can lead to lower production of testosterone. A doctor may then order testing to see if there is a genetic explanation for the signs and symptoms. 47,XYY may produce a wide array of symptoms, although most people with the extra Y chromosome it entails will exhibit only some, but not all, of the following: Tall stature; Low muscle tone; Speech delay/expressive language disorder ; Subtle developmental delays; Autism; Learning disability; … A doctor may then order testing to see if there is a genetic explanation for the signs and symptoms. Klinefelter syndrome does not usually cause any obvious symptoms early in childhood, and even the later symptoms may be difficult to spot. In early childhood, XYY boys are very active, with good eating and … Associated symptoms are arachnodactyly, joint hyperlaxity, aortic root dilatation, and lens dislocation (ectopia lentis). XYY syndrome is a sex chromosome abnormality in which boys are born with two Y chromosomes and one X chromosome. Usually this disease does not affect the appearance and well-being of a person. People with the 47,XYY karyotype have an increased growth velocity from early childhood, with an average final height approximately 7 cm (3") above expected final height. The characteristic signs and symptoms of XYY syndrome are often evident in the early stage, as learning and other problems related to the cognitive sphere reach an obvious level of complexity. Klinefelter syndrome, also known as XXY syndrome, is a condition in boys and men that’s caused by an extra X chromosome. XYY syndrome is a genetic condition in which a human male has an extra male (Y) chromosome, ... Signs and symptoms Physical traits. In usual cases, diagnostic suspicion begins with the identification of physical signs … Abnormalities related to mental health, which include autism, attention difficulties, learning disabilities, immature behavior and emotional or behavioral issues ; Motor skill impediment causes delayed writing ability; Speech difficulty; Less gripping power or less muscle strength causes less gripping power due to weak … This syndrome also presents with motor and cognitive development issues, some patients are taller than average. 47,XYY syndrome is associated with an increased risk of learning disabilities and delayed development of speech and language skills. This syndrome is caused by a mutation in the EZH2 gene. There are not very many symptoms that are visible and clearly point to the presence of the XYY syndrome. A doctor may then order testing to see if there is a genetic explanation for the signs and symptoms. The signs and symptoms of XYY syndrome are often unnoticeable and subtle. 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