$A$ disease caused by an autosomal primary non-disjunction is

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

$A$ person having $45$ chromosomes where the $Y$ chromosome is absent. Such a condition is known as

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 development 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:

Example for autosomal hyper aneuploidy is

The monosomic condition in human beings depicted as $XO$ is referred to as