A) 19trisomy
B) 21 trisomy
C) one X-chromosome
D) two X and one Y-chromosome
Correct Answer: B
Solution :
Downs syndrome is caused by trisomy of chromosome number 21. It is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. It is typically associated with physical growth delays, characteristic facial features and mild to moderate intellectual disability.
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