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(D) The symptoms described,such as a small round head,furrowed tongue,partially open mouth,broad palm with a characteristic palm crease,and retarded p

Vedclass · Accepted Answer

Trisomy of chromosome $21$

Vedclass · Answer

(D) The symptoms described,such as a small round head,furrowed tongue,partially open mouth,broad palm with a characteristic palm crease,and retarded physical,psychomotor,and mental development,are characteristic of $Down$ syndrome.$Down$ syndrome is a genetic disorder caused by the presence of an extra copy of chromosome $21$,which is known as Trisomy $21$.This results in a total of $47$ chromosomes instead of the normal $46$.

If a female individual has a small round head,furrowed tongue,partially open mouth,and a broad palm with a characteristic palm crease,and also exhibits retarded physical,psychomotor,and mental development,the karyotype analysis of such an individual will show:

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