a chromosomal disorder wherein a boy is born with a double complement of the normal XY chromosome pair. Skeletal deformations, abnormal genitalia, and cognitive retardation are typical impacts. More than fifty percent of inflicted people examined had IQ's no more than 70, and some displayed odd actions. Enlarged breasts and eunuchoid abdominal and hip fat are some of the physical indicators.

XXYY SYNDROME: "Individuals with XXYY syndrome often have skeletal deformities. "
Cite this page: N., Pam M.S., "XXYY SYNDROME," in PsychologyDictionary.org, April 29, 2013, https://psychologydictionary.org/xxyy-syndrome/ (accessed September 23, 2021).