Which statement regarding sex chromosome abnormalities is incorrect?
Individuals with three X chromosomes are indistinguishable from individuals with only two X
chromosomes, except by karyotype.
Individuals with two X chromosomes and one Y chromosome are abnormally tall females of average
intelligence.
Individuals with only a single X chromosome are females who exhibit Turner Syndrome and are
sterile.
Individuals with two X chromosomes and one Y chromosome are sterile males that can experience
breast enlargement and other female characteristics, if untreated.