A) One extra chromosome
B) One extra sex chromosome
C) One extra chromosome in 21st pair
D) One less sex chromosome
Correct Answer: C
Solution :
Mongolism or Down?s syndrome is caused by nondisjunction of 21st chromosome pair during anaphase I. As a result (n + 1) gametes are formed. Fertilization with normal gamete (n) result in trisomy (2n + 1).
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