47,XYY syndrome http://purl.bioontology.org/ontology/MEDDRA/10056894 http://purl.bioontology.org/ontology/MESH/C535317 http://purl.obolibrary.org/obo/NCIT_C85237 https://en.wikipedia.org/wiki/XYY_syndrome https://www.wikidata.org/wiki/Q267602 47 XYY syndrome 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. Jacob's syndrome Jacobs syndrome XYY syndrome YY syndrome double Y syndrome double male syndrome XYY-syndrom chromosomal gain syndrome 47,XYY allosomal chromosomal syndrome The Complete Dictionary of Sexology