Question

Which of the following is incorrect with respect to Klinefelter’s syndrome?

(a) The fusion of an abnormal egg with normal sperm

(b) The fusion of a normal egg with an abnormal sperm

(c) The fusion of a normal egg with a normal sperm

(d) An additional copy of X-chromosome

This question was posed to me by my college professor while I was bunking the class.

My enquiry is from Inheritance and Variation Principles in chapter Principles of Inheritance and Variation of Biology – Class 12

Answer 1

Correct answer is (c) The fusion of a normal egg with a normal sperm

The explanation: The fusion of a normal egg with a normal sperm leads to the formation of a healthy baby. Klinefelter’s syndrome appears due to the union of an abnormal egg (two X-chromosomes + autosomes) with a normal sperm (Y-chromosome+ autosomes) or a normal egg (X-chromosome + autosomes) with abnormal sperm (XY chromosomes+ autosomes).