AGB 121: Principles of Animal Genetics and Population Genetics (2+1)

TRIPLE X SYNDROME

• Triple X syndrome, also called trisomy X or 47,XXX, is characterized by the presence of an additional X chromosome in each of a female's cells.
• This condition occurs in about 1 in 1,000 newborn girls.
• Other names people use for triple X syndrome
  • Triplo X syndrome
  • Trisomy X
  • 47,XXX
  • XXX syndrome
• Main phenotypic characteristics
  • Triple X syndrome cases are phenotypically normal and fertile females.
  • Triple X syndrome cases typically have tall stature by adolescence and normal sexual development and puberty.