what phenotype is associated with the genotype 47 xxy
Klinefelter syndrome Klinefelter syndrome (KS) also known as 47,XXY or XXY, is the set of symptoms that result from two or more X chromosomes in males.[2] The primary features are sterility and small testicles.[2][8] Often symptoms may be subtle and many people do not realize they are affected.[1] Sometimes symptoms are more prominent and may include weaker muscles, greater height, poor coordination, less body hair, breast growth, and less interest in sex.[1] Often it is only at puberty that these symptoms are noticed.[4] Intelligence is usually normal; however, reading difficulties and problems with speech are more common.[1] Symptoms are typically more severe if three or more X chromosomes are present.[1]