Question

68. The Down's syndrome is due to
(A) X-chromosome
(B) Y-chromosome
(C) Loss of an autosome
(D) Gain of an autosome
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Answer 1

Answer:

Down syndrome is a genetic disorder caused when abnormal cell division results in an extra full or partial copy of chromosome 21. This extra genetic material causes the developmental changes and physical features of Down syndrome

Answer 2

Answer:

X-chromosome

Explanation:

it is due to increase or decrease the number of X-chromosome