Q. Absence of one sex chromosome causes
A) Turner’s syndrome
B) Klinefelter’s syndrome
C) Down’s syndrome
D) Tay-Sach’s syndrome
Explanation
Turner’s syndrome is due to monosomy(2n − 1) and the chromosome constituent is 44 + XO=45. The individual is female with under developed ovary, webbed neck. Kinefelter’s syndrome is due to condition of 44+XXY=47. The sex is male but have secondary sexual characters like female. Down’s syndrome is due to trisomy of 21st chromosome.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.