Write notes on any two of the following:
Turner syndrome.

Explanation

Turner Syndrome This condition is characterised by one missing X-chromosome which results in 45+ XO chromosomal complement in affected person. It is produced by the union of an abnormal o egg and a normal X sperm or a normal egg and an abnormal O sperm. The individual has 45 chromosomes (44+ X) Instead of 46. Such people are sterile females who have rudimentary ovaries, undeveloped breasts, short stature, small uterus and abnormal intelligence. They may not ovulate or menstruate. One in every 3000 children is a victim.