Match column - I with column - II and select the CORRECT option form the codes given below
`{:(,"Column - I",,"Column - II"),((1),"Multiple alleles",(i),"Phenylketonuria in humans"),((2),"Polygenes",(ii),"Blood groups in humans"),((3),"Pleiotropy",(iii),"Skin colour in humans"):}`

Options

A. 1 - (ii), 2 - (i) , 3 - (iii)
B. 1 - (ii), 2 - (iii) , 3 - (i)
C. 1 - (iii), 2 - (ii) , 3 - (i)
D. 1 - (i), 2 - (iii) , 3 - (ii)

Answer

To solve the problem of matching Column - I with Column - II, we need to analyze each term in Column - I and find the corresponding term in Column - II based on their definitions and examples.

### Step-by-Step Solution:

1. **Identify Multiple Alleles**:
- **Definition**: Multiple alleles refer to the presence of more than two alleles for a particular gene in a population.
- **Example**: The ABO blood group system in humans is a classic example of multiple alleles, where the blood type is determined by three alleles: A, B, and O.
- **Match**: Therefore, Multiple alleles (1) matches with Blood groups in humans (ii).

2. **Identify Polygenes**:
- **Definition**: Polygenes refer to the phenomenon where a single trait is controlled by multiple genes.
- **Example**: Skin color in humans is a common example of polygenic inheritance, where several genes contribute to the phenotype.
- **Match**: Thus, Polygenes (2) matches with Skin color in humans (iii).

3. **Identify Pleiotropy**:
- **Definition**: Pleiotropy occurs when one gene influences multiple phenotypic traits.
- **Example**: Phenylketonuria (PKU) is a genetic disorder caused by a mutation in a single gene that affects multiple traits, including intellectual disability and other health issues.
- **Match**: Hence, Pleiotropy (3) matches with Phenylketonuria in humans (i).

### Final Matches:
- **1 (Multiple alleles)** → **ii (Blood groups in humans)**
- **2 (Polygenes)** → **iii (Skin color in humans)**
- **3 (Pleiotropy)** → **i (Phenylketonuria in humans)**

### Conclusion:
The correct matching is:
- 1 → ii
- 2 → iii
- 3 → i

Thus, the correct option is **(2)**.

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