Allosomic trisomy condition is seen in

Which chromosomal aberration does the following figure indicate?

$21$ trisomy in humans causes

Edward's syndrome,Patau's syndrome,and Down's syndrome are due to:

$A$ cross between a white-eyed female and a red-eyed male Drosophila gives red-eyed females and white-eyed males. Occasionally,the cross gives white-eyed females and red-eyed males. This is due to:

Which of the following does not represent trisomy?