A rare mosaic type of this disorder exists where some of the body's cells possess the normal genotype.  
A rare mosaic type of this disorder exists where some of the body's cells possess the normal genotype.  Risk factors are not completely known, though advanced maternal age seems to play a minor role. Symptoms  may include gynecomastia, abnormal body proportions, learning disabilities, and a diminishing of secondary  sex characteristics. However, those with the disorder may have few or none of these symptoms, and may  only have the most general symptom, infertility. For ten points, name this genetic disorder that occurs in  about 1 in every 700 boys, characterized by the genotype XXY.
A rare mosaic type of this disorder exists where some of the body's cells possess the normal genotype.  
Klinefelter’s syndrome