Match column I with column II and select the correct option from the given codes
`{:(,"Column I",,"Column II"),("A.","Chromosomal aberration","(i)","An additional sex chromosome"),("B.","Down' syndrome","(ii)","Inversion"),("C.","Klinefelter's syndrome","(iii)","Presence of an extra chromosome"),("D.","Turner's syndrome","(iv)","Absence of sex chromosome"):}`

Options

A. A-(ii),B-(iv),C-(i),D-(iii)
B. A-(ii),B-(iv),C-(iii),D-(i)
C. A-(ii),B-(iii),C-(i),D-(iv)
D. A-(iii),B-(iv),C-(i),D-(ii)

Answer

To solve the matching question between Column I and Column II, we will analyze each item in Column I and find its corresponding match in Column II step by step.

### Step-by-Step Solution:

1. **Identify Chromosomal Aberration (A)**:
- Chromosomal aberration refers to structural changes in chromosomes. One type of chromosomal aberration is **inversion**, where a segment of a chromosome is reversed end-to-end.
- **Match**: A (Chromosomal aberration) → (ii) Inversion.

2. **Identify Down Syndrome (B)**:
- Down syndrome is caused by the presence of an extra chromosome, specifically an extra copy of chromosome 21. This condition is also known as **trisomy 21**.
- **Match**: B (Down syndrome) → (iii) Presence of an extra chromosome.

3. **Identify Klinefelter's Syndrome (C)**:
- Klinefelter's syndrome is a genetic condition in males characterized by the presence of an additional X chromosome (XXY instead of the typical XY).
- **Match**: C (Klinefelter's syndrome) → (i) An additional sex chromosome.

4. **Identify Turner's Syndrome (D)**:
- Turner's syndrome occurs when a female is partially or completely missing one of her X chromosomes, which is referred to as the absence of a sex chromosome.
- **Match**: D (Turner's syndrome) → (iv) Absence of sex chromosome.

### Final Matches:
- A → (ii) Inversion
- B → (iii) Presence of an extra chromosome
- C → (i) An additional sex chromosome
- D → (iv) Absence of sex chromosome

### Summary of the Correct Matches:
- A → (ii)
- B → (iii)
- C → (i)
- D → (iv)