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(D) The disorder described by Langdon Down is Down's syndrome,which is caused by the presence of an additional copy of chromosome number $21$ (Trisomy

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$A$ and $C$ both

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(D) The disorder described by Langdon Down is Down's syndrome,which is caused by the presence of an additional copy of chromosome number $21$ (Trisomy $21$).Key characteristics of Down's syndrome include:$1$. Mental retardation.$2$. Short stature with small round head.$3$. Furrowed tongue and partially open mouth.$4$. Palm is broad with characteristic palm crease.$5$. Physical,psychomotor,and mental development is retarded.Gynaecomastia is a characteristic of Klinefelter's syndrome,not Down's syndrome.Therefore,both $A$ and $C$ are correct characteristics of Down's syndrome.

Which of the following are characteristics of the disorder described by Langdon Down?

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