Q. Number of chromosomes in Down’s syndrome are
A) 46
B) 47
C) 48
D) 49
Explanation
Down’s syndrome is due to the trisomy of 21^(st) pair of autosome. Therefore, a Down’s syndrome patient has 47 chromosomes, i.e., 45 A + XX/XY.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.