A pregnant human female was advised to undergo MTP. It was diagnosed that the fetus she was carrying had developed from a zygote having 45 chromosomes with only one X chromosome.

Q. A pregnant human female was advised to undergo MTP. It was diagnosed that the fetus she was carrying had developed from a zygote having 45 chromosomes with only one X chromosome. 

(a) What is this condition called and how does it arise? 

(b) Why was she advised to undergo MTP?

Ans: (a) The embryo has Turner’s Syndrome [0.5] due to aneuploidy of the sex chromosome. Such a disorder is caused due to the absence of one of the X chromosomes, i.e., 45 with XO. 

(b) She was advised MTP as the child will have the following problems: 

· rudimentary ovaries 

· poorly developed breasts 

· lack of other secondary sexual characters 

· delayed or no onset of the menstrual cycle and infertile.