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(B) Down's syndrome is a chromosomal disorder caused by the presence of an additional copy of chromosome number $21$ (trisomy of $21$).Individuals wit

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Down's syndrome

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(B) Down's syndrome is a chromosomal disorder caused by the presence of an additional copy of chromosome number $21$ (trisomy of $21$).Individuals with Down's syndrome exhibit several characteristic features,including a short stature,a small round head,a furrowed (fissured) tongue,and partially open mouth.They also typically show physical,psychomotor,and mental retardation.Therefore,the correct option is $B$.

Fissured tongue,short stature,and physical or mental retardation are characteristic features of which disorder?

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