An abnormal male child is born to normal parents. This child shows a short neck,stubby hands,slanting eyes,a permanently open mouth with a projecting upper lip,and short stature. This abnormality can be attributed to:
- AAn extra $Y$ chromosome
- BAn extra $X$ chromosome
- CAn extra chromosome in the $21^{st}$ pair of autosomes
- DAbsence of $X$ chromosome leading to a total of $45$ chromosomes instead of the normal $46$
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