Select the incorrect statement regarding Down | vedclass

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(D) Down's syndrome is a genetic disorder caused by the presence of an extra copy of chromosome number $21$ (trisomy of $21$).It is a chromosomal diso

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It occurs due to crossing over.

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(D) Down's syndrome is a genetic disorder caused by the presence of an extra copy of chromosome number $21$ (trisomy of $21$).It is a chromosomal disorder,not a gene mutation caused by crossing over.Key features include mental retardation,short stature,small round head,furrowed tongue,and partially open mouth.Therefore,the statement that it occurs due to crossing over is incorrect.

Select the incorrect statement regarding Down's syndrome.

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