Question

Match column I with column II and choose the correct option.
$\begin{array}{cccc}& \text{Column l}& & \text{Column ll}\\ i.& \text{Monosomy}& a& 2n+1\\ ii.& \text{Tetrasomy}& b& 2n-1\\ iii.& \text{Tetraploidy}& c& 2n+2\\ iv.& \text{Trisomy}& d& 4n\end{array}$

• A. i-b, ii-d, iii-c, iv-a
• B. i-c, ii-b, iii-a, iv-d
• C. i-d, ii-a, iii-c, iv-b
• D. i-b, ii-c, iii-d, iv-a

Answer 1

The correct option is D i-b, ii-c, iii-d, iv-a

Let us assume that n is the number of chromosomes in a haploid cell.

Monosomy refers to the condition where one of the homologous counterparts of a particular chromosome is absent in a diploid cell. This is represented by 2n - 1.

Tetrasomy refers to the condition where an extra pair of homologous chromosomes is present in the cell. This is represented by 2n + 2.

Tetraploidy is the condition in which the cells have four haploid sets of chromosomes. This is represented by 4n.

Trisomy is the presence of three copies of a particular chromosome in the diploid cell. This is represented by 2n + 1.