If the haploid chromosome number in a cell is $12$,then the monosomic number will be:

Match Column $I$ with Column $II$ and find the correct answer.

Column $I$	Column $II$
$(A)$ Aneuploidy	$(i)$ Increase in whole set of chromosomes
$(B)$ Monoploidy	$(ii)$ Loss or gain of a chromosome
$(C)$ Polyploidy	$(iii)$ Two sets of chromosomes
$(D)$ Diploidy	$(iv)$ $A$ single set of chromosomes

$A$ person who is trisomic for the $21^{st}$ pair of chromosomes has:

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

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:

Persons with the following syndrome have a tendency of tall structure,mental defects and a strong antisocial behaviour.