Question

Match List I with List - II.

Choose the correct answer from the options given below:

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

Hint:

Deletion = Subtract; Duplication = Add; Inversion = Flip; Translocation = Move.

Answer 1

The Correct Option is B

Concept: Structural chromosomal aberrations involve changes in the physical arrangement of genes on a chromosome. These are often observed as a result of stress during the callus phase of tissue culture.

Step 1: Defining Numerical Changes.
Loss of genes (A) occurs when a segment of a chromosome breaks off and is lost, a process known as Deletion (II). Gene multiplication (C) occurs when a segment is repeated, known as Duplication (I).

Step 2: Defining Positional Changes.
When a chromosome segment breaks and reattaches in the reverse direction, it results in an Alteration of gene order (B), called Inversion (IV). The Movement of chromosome segments to a new location (D) (either on the same chromosome or a different one) is defined as Translocation (III).

Step 3: Conclusion.
Matching the definitions: A-II, B-IV, C-I, D-III.