Ques. Down’s syndrome in humans is due to
A. three ‘X’ chromosomes
B. three copies of chromosome 21
C. monosomy
D. two ‘Y’ chromosomes.
Answer:B
Ques. Down’s syndrome in humans is due to
A. three ‘X’ chromosomes B. three copies of chromosome 21 C. monosomy D. two ‘Y’ chromosomes.