Ability of a gene to express more than one characters is called Pleiotropy.
! The occurance of a bacterium in more than one morphological forms is called poly-morphisms.

Options

A. If both As and R are correct and R is correct explanation of As
B. If both As and R are correct but R is not correct explanation of As
C. If As is correct, R is wrong
D. If both As and R are wrong.

Answer

To solve the question regarding the concepts of pleiotropy and polymorphism, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "the ability of a gene to express more than one character is called pleiotropy."
- **Explanation**: Pleiotropy is a genetic phenomenon where a single gene influences multiple phenotypic traits. This means that one gene can affect various characteristics in an organism.

2. **Understanding the Reason**:
- The reason given is "the occurrence of a bacterium in more than one morphological form is called polymorphism."
- **Explanation**: Polymorphism refers to the occurrence of different forms or morphs within a species. In this context, it describes how bacteria can exist in various shapes or forms.

3. **Evaluating the Correctness of Assertion and Reason**:
- Both the assertion and reason are factually correct:
- Pleiotropy is indeed the ability of a gene to affect multiple traits.
- Polymorphism correctly describes the presence of multiple forms in bacteria.
- However, the reason does not explain the assertion. While both statements are true, they refer to different concepts.

4. **Choosing the Correct Option**:
- Given the evaluation, we need to determine the relationship between the assertion and the reason.
- Since both statements are correct, but the reason does not explain the assertion, the correct option is: "Both assertion and reason are correct, but the reason is not the correct explanation of the assertion."

### Final Answer:
The correct answer is: "Both assertion and reason are correct, but the reason is not the correct explanation of the assertion."

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