Mongolism syndrome is caused by

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(C) Mongolism,also known as Down's syndrome,is caused by the nondisjunction of the $21^{st}$ chromosome pair during anaphase $I$ of meiosis.As a resul

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One extra chromosome in $21^{st}$ pair

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(C) Mongolism,also known as Down's syndrome,is caused by the nondisjunction of the $21^{st}$ chromosome pair during anaphase $I$ of meiosis.As a result,gametes with $(n + 1)$ chromosomes are formed.Fertilization of such an abnormal gamete with a normal gamete $(n)$ results in a zygote with trisomy $(2n + 1)$,specifically trisomy $21$.

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