Feminized males have . . . . . . chromosomes.

The Philadelphia chromosome is found in patients suffering from

$XO-$ chromosomal abnormality in human beings causes

Sometimes,the presence of $XX$ and $XY$ in males is due to:

Briefly explain Down's syndrome.

Identify the disease on the basis of the following characters:
$(1)$ Short stature with a small round head.
$(2)$ Furrowed tongue and partially open mouth.
$(3)$ Palm is broad with a characteristic palm crease.