Question

This abnormality occurs due to monosomy (2n - 1); the individual has 2n = 45 chromosomes with 44 + XO genotype

• A. Edward's syndrome
• B. Down's syndrome
• C. Turner's syndrome
• D. Klinefelter's syndrome

Answer 1

The correct option is C Turner's syndrome

Turner's syndrome is due to monosomy (2n 1). It occurs by the union of an allosome free egg (22 + 0) and a normal X sperm or a normal egg and an allosperm free sperm (22 + 0).

Turners syndrome (most common type of female genetic disease) having XO genotype is caused by the absence of X chromosomes in female. These are sterile females with poorly developed ovaries, small uterus and underdeveloped breasts. They have webbed neck and broad chest. The individual has 2n = 45 chromosomes (44 + XO) instead of 46.

So, the correct answer is 'Turner's syndrome'.