https://homosaurus.org/v3/homoit0002861 homoit0002861 Jacobs syndrome 47XYY XYY syndrome 2023-06-28 xsd:date 2023-06-28 xsd:date https://homosaurus.org/v3/homoit0000669 Variaciones intersex People with Jacobs syndrome develop with an extra Y chromosome. They might not have any obvious physical variations as a result, or they may be taller than usual or have other identifiable differences that do not relate to sex characteristics. Some people with Jacobs syndrome may also have a smaller-than-typical penis or scrotum, hypospadias, and/or undescended testicles.