It's a genetic disorder that affects only females, resultingwhen the X chromosome is missing in a pair or partially.
Hence they have 45 chromosomes with the 23rd pair represented as XO.
Due to the missing X chromosome, although these individuals are females, they have under-developed female characteristics.
Features of Turner syndrome:
Short neck with a webbed appearance, low hairline at the back of the neck, low-set ears, hands and feet that are swollen or puffy at birth, and soft nails that turn upward.
They are females with short stature and underdeveloped feminine characteristics.