Question

Match the LIST-I with LIST-II. LIST-I: A. Nullisomic, B. Monosomic, C. Trisomic, D. Tetrasomic. LIST-II: I. \(2n+1\), II. \(2n+2\), III. \(2n-2\), IV. \(2n-1\).

• A. A-II, B-IV, C-I, D-III
• B. A-I, B-III, C-II, D-IV
• C. A-III, B-IV, C-I, D-II
• D. A-I, B-II, C-IV, D-III

Hint:

Nullisomic \(=2n-2\), Monosomic \(=2n-1\), Trisomic \(=2n+1\), and Tetrasomic \(=2n+2\).

Answer 1

The Correct Option is C

Concept:
Aneuploidy means change in chromosome number due to loss or gain of one or more chromosomes.

Step 1: Nullisomic.
Nullisomic means loss of both chromosomes of a homologous pair. \[ 2n-2 \] So, \[ A\rightarrow III \]

Step 2: Monosomic.
Monosomic means loss of one chromosome. \[ 2n-1 \] So, \[ B\rightarrow IV \]

Step 3: Trisomic.
Trisomic means addition of one extra chromosome. \[ 2n+1 \] So, \[ C\rightarrow I \]

Step 4: Tetrasomic.
Tetrasomic means addition of two extra chromosomes of the same pair. \[ 2n+2 \] So, \[ D\rightarrow II \] Therefore, \[ A-III,\ B-IV,\ C-I,\ D-II \] \[ \therefore \text{Correct Answer is (C)} \]