Trisomy X

From Wikipedia,

Due to the lyonization, inactivation and formation of a Barr body, in all female cells, only one X chromosome is active at any time in a female cell. Thus, triple X syndrome most often causes no unusual physical features or medical problems. Females with the condition may have menstrual irregularities, and, although rarely exhibiting severe mental impairments, have an increased risk of learning disabilities, delayed speech, deficient language skills, and delayed development of motor skills.



Post Date: 3 Nov 09