[A]: The series of enzyme controlled reactions determine traits in an organism.
[R]: Since the structure of specific proteins (enzymes) is controlled by the genes and follows determination of traits

Options

A. (a) If both A and R are true and R is the correct explanation of A
B. (b) If both A and R are true but R is not the correct explanation of A
C. (c) If A is true and R is false
D. (d) If both A and R are false

Answer

To analyze the assertion and reason provided in the question, we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "the series of enzyme-controlled reactions determine traits in an organism."
- This means that the biochemical processes mediated by enzymes play a crucial role in the expression of traits.

2. **Understanding the Reason**:
- The reason states that "the structure of specific proteins (enzymes) is controlled by the genes and follows determination of traits."
- This indicates that genes encode the information necessary to produce enzymes, which in turn influence the traits of an organism.

3. **Connecting the Assertion and Reason**:
- Enzymes are proteins that catalyze biochemical reactions. The specific structure and function of these enzymes are determined by the genetic information encoded in an organism's DNA.
- Therefore, the assertion is correct because enzyme-controlled reactions are indeed fundamental in determining traits.

4. **Evaluating the Truth of Both Statements**:
- Both the assertion and the reason are true. The reason provides a valid explanation for the assertion, as it clarifies how genes influence traits through the production of enzymes.

5. **Conclusion**:
- Since both the assertion and reason are true, and the reason correctly explains the assertion, we conclude that the correct answer is option A: "Both A and R are true, and R is the correct explanation of A."