47,XYY Syndrome

**Semantic type:** Disease or Syndrome

**Definition:** A condition caused by the presence of an extra Y chromosome resulting in 47,XYY karyotype in an individual with male phenotype. The condition is characterized by tall stature, increased risk of learning disabilities, and delayed development of speech and language. Testicular function and size are normal.

**Synonyms:** - 47,XYY - XYY Syndrome - XYY Syndrome