In Klinefelter's syndrome, what is generally the set of sex chromosome
$XX$
$XY$
$XXY$
$XYY$
Loss of a single chromosome produces a condition called.
An abnormal male child is born to normal parents. This child shows a short neck, stubby hands, slanting eyes, permanently open mouth with projecting upper lip and short stature. This abnormality can be attributed to
Which of the following statements are correct about Klinefelter's Syndrome?
$A$. This disorder was first described by Langdon Down $(1866)$.
$B$. Such an individual has overall masculine development. However, the feminine developement is also expressed.
$C$. The affected individual is short statured.
$D$. Physical, psychomotor and mental development is retarded.
$E$. Such individuals are sterile.
Choose the correct answer from the options given below:
Down’s syndrome in humans is due to
The cause of Turner's syndrome in man is