Edward syndrome is on account of .......

Mongolism syndrome is caused by

Choose the correct answer regarding the following statements:
$(i)$ Sickle-cell anaemia is controlled by three pairs of alleles.
$(ii)$ Trisomy is a chromosomal disorder.
$(iii)$ $47$ chromosomes are present in a person having Turner's syndrome.

Identify the given figure and select the correct option.
$\quad\quad\quad P\quad\quad Q$

Explain the difference between Euploidy and Aneuploidy.

The loss of a chromosomal segment is due to