<unk>  is a form of chromosomal variation characterized by the presence of an extra<unk>  chromosome in each cell of a human female. The condition is also known as<unk> -X, trisomy<unk> ,<unk> XX syndrome, and 47,XXX aneuploidy.<unk> <unk>  results during division of a parent's reproductive cells, which occurs about once in every 1,000 births. People with trisomy<unk>  do not exhibit any symptoms and cannot be distinguished from normal<unk> X females unless karyotyping is performed.
Triple X syndrome
Joubert syndrome
Smith-Magenis syndrome
XX male syndrome
Wolfram syndrome
Axenfeld syndrome
Bardet-Biedl syndrome
Goldenhar syndrome