Question

Select the option which appropriately fills A –D in the below diagram.

• A. A: Monosomy; B: Trisomy; C: Tetrasomy; D: Nullisomy
• B. A: Nullisomy; B: Monosomy; C: Tetrasomy; D: Trisomy
• C. A: Monosomy; B: Trisomy; C: Nullisomy; D: Tetrasomy
• D. A: Nullisomy; B: Trisomy; C: Monosomy; D: Tetrasomy

Answer 1

The correct option is C A: Monosomy; B: Trisomy; C: Nullisomy; D: Tetrasomy

Monosomy is the condition of having a diploid chromosome complement in which one chromosome lacks its homologous partner. It is a type of hypoploidy which is represented by (2n-1).

Trisomy is a condition where there is an additional chromosome in the dipolid set, which is represented as (2n+1).

In some chromosomal abnormalities when there is loss of one complete pair of chromosome which is represented as (2n-2), is known as nullisomy.

Tetrasomy is a type of aneuploidy (Hyperploidy) where there is a gain of extra two chromosomes of the same type (2n+2).