Question

Match List - I with List - II. List - I
A. Trisomy
B. Monosomy
C. Deletion
D. Super female
List - II
I. Loss of chromosome
II. Extra chromosome (2n+1)
III. Loss of chromosome segment
IV. Extra X chromosome

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

Hint:

Trisomy = +1 chromosome
Monosomy = -1 chromosome
Deletion = loss of segment

Answer 1

The Correct Option is A

Concept:
Chromosomal abnormalities are classified based on numerical and structural changes.

Step 1: Trisomy (A)

• Condition where one extra chromosome is present.
• Represented as $2n + 1$. Thus, A $\rightarrow$ II.

Step 2: Monosomy (B)

• Loss of one chromosome.
• Represented as $2n - 1$. Thus, B $\rightarrow$ I.

Step 3: Deletion (C)

• Structural abnormality.
• A segment of chromosome is lost. Thus, C $\rightarrow$ III.

Step 4: Super female (D)

• Condition with extra X chromosome (XXX).
• Known as triple X syndrome. Thus, D $\rightarrow$ IV. Final Matching: \[ A-II,\; B-I,\; C-III,\; D-IV \] \[ \boxed{\text{Option (A)}} \]