This is seen in females and is characterized by-
(i) Dysgenesis of gonads
(ii) Sexual infantilism
(iii) Webbed neck
(iv) Prominent ears
(v) Increased carrying angle of arms (cubitus valgus)
(vi) Dystrophy of the nails and hypoplastic nipples
Individuals with Turner’s syndrome have only 45 chromosomes ie., 44 (22 pairs) autosomes and only one X chromosome instead of the normal 2 X chromosomes (XO). This arises due to meiotic abnormality when an egg does not receive any X chromosome. If such an egg is fertilized by a sperm carrying an X chromosome, the result will be 44 autosomes and only one X chromosome.
One in 5000 births (in west) is estimated to be affected by this syndrome.