Which of the following disorders is seen in human females only?

Epicanthus is a symptom of:

Match Column $-I$ with Column $-II$ and select the correct option.

Column $-I$	Column $-II$
$(P)$ Turner syndrome	$(i)$ Sex chromosome $(2n-1)$
$(Q)$ Down syndrome	$(ii)$ Sex chromosome $(2n+1)$
$(R)$ Klinefelter syndrome	$(iii)$ Autosomal $(2n+1)$

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:

In Klinefelter's syndrome,what is generally the set of sex chromosomes?

The trisomic condition of $Down's$ syndrome arises due to: