A pseudogene has

Options

A. Homology with functional gene
B. Homology with product of normal gene
C. Analogy with functional gene
D. Analogy with product of normal gene.

Answer

To answer the question "A pseudogene has," we will analyze the characteristics of pseudogenes and compare them with the options provided.

### Step-by-Step Solution:

1. **Understanding Pseudogenes**:
- Pseudogenes are segments of DNA that resemble functional genes but have lost their ability to encode proteins due to mutations.
- They are considered "non-functional" or "inactive" genes.

2. **Homology vs. Analogy**:
- **Homology** refers to similarity due to shared ancestry. In this context, it means that pseudogenes share a similar DNA sequence with functional genes.
- **Analogy** refers to similarity in function or appearance but not due to shared ancestry. This is not applicable to pseudogenes.

3. **Characteristics of Pseudogenes**:
- Pseudogenes have a DNA sequence that is homologous to a functional gene, meaning they share a similar structure.
- However, they are unable to produce the functional protein that the functional gene can produce due to mutations.

4. **Evaluating the Options**:
- **Homology with functional gene**: This is true as pseudogenes share a similar DNA sequence with functional genes.
- **Homology with product of normal gene**: This is false as pseudogenes do not produce functional products.
- **Analogy with functional gene**: This is false because analogy implies a similarity in function, which pseudogenes do not have.
- **Analogy with the product of normal gene**: This is also false for the same reason.

5. **Conclusion**:
- The correct answer is **homology with functional gene** since pseudogenes share a similar DNA sequence with functional genes but lack the ability to produce functional proteins.

### Final Answer:
A pseudogene has **homology with functional gene**.

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