Question

Turner's syndrome does not occur in males $(44+Y)$ because.

• A. An ovum is seldom devoid of X-chromosome
• B. A male sperm does not penetrate X-deficient ovum
• C. Foetus with $44+Y$ complement dies
• D. Unexplained

Answer 1

The correct option is A An ovum is seldom devoid of X-chromosome

Turner's syndrome is due to a chromosomal abnormality in which all or part of one of the X chromosomes is missing or altered. For Turner's syndrome to occur in male, it should be devoid of an X chromosome. For this to happen, female ovum must be devoid of X-chromosome which never happens. Hence, a sperm carrying a Y chromosome will definitely fuse with an X-chromosome present in ovum, thus leading to a normal zygote (XY).

So, the correct answer is 'An ovum is seldom devoid of X-chromosome'.