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 its corresponding match in Column - II based on biological concepts.

### Step 1: Identify the terms in Column - I
- **1. Multiple alleles**
- **2. Polygenes**
- **3. Pleiotropy**

### Step 2: Analyze each term and find its match

#### For Multiple alleles:
- **Definition**: Multiple alleles refer to a situation where a single trait is controlled by three or more alleles.
- **Example**: The human blood groups (A, B, AB, O) are determined by multiple alleles.
- **Match**: Therefore, Multiple alleles match with **(ii) Blood groups in humans**.

#### For Polygenes:
- **Definition**: Polygenes are groups of genes that collectively influence a particular trait, leading to continuous variation.
- **Example**: Skin color in humans is a trait that is influenced by multiple genes (polygenic inheritance).
- **Match**: Thus, Polygenes match with **(iii) Skin color in humans**.

#### For Pleiotropy:
- **Definition**: Pleiotropy occurs when a single gene affects multiple phenotypic traits.
- **Example**: Phenylketonuria (PKU) is a genetic disorder caused by a mutation in a single gene that affects multiple traits, including metabolism of phenylalanine.
- **Match**: Hence, Pleiotropy matches with **(i) Phenylketonuria in humans**.

### Step 3: Compile the matches
Based on the analysis:
- **1. Multiple alleles** → (ii) Blood groups in humans
- **2. Polygenes** → (iii) Skin color in humans
- **3. Pleiotropy** → (i) Phenylketonuria in humans

### Final Matching:
- 1 → ii
- 2 → iii
- 3 → i

### Conclusion:
The correct option from the codes given below is **Option 2**.

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