Assertion : Repetitive sequences make up very large portion of human genome.
Reason : Repetitive sequences do not have direct coding functions in the genome.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. if both assertion and reason are false.

Explanation

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

### Step 1: Understand the Assertion
The assertion states that "Repetitive sequences make up a very large portion of the human genome."
- This is indeed true. Repetitive sequences, such as satellite DNA, mini-satellites, and micro-satellites, comprise a significant percentage of the human genome, estimated to be around 50% or more.

**Hint:** Consider the composition of the human genome and the types of DNA sequences present.

### Step 2: Understand the Reason
The reason states that "Repetitive sequences do not have direct coding functions in the genome."
- This statement is also true. Repetitive sequences generally do not code for proteins or functional RNA. Instead, they may play roles in chromosomal structure, regulation of gene expression, and evolutionary processes.

**Hint:** Think about the roles of non-coding DNA and how they differ from coding sequences.

### Step 3: Analyze the Relationship Between Assertion and Reason
Now, we need to determine if the reason provided correctly explains the assertion.
- While both statements are true, the reason does not directly explain why repetitive sequences make up a large portion of the genome. The assertion is about the quantity of repetitive sequences, while the reason discusses their lack of coding function.

**Hint:** Evaluate whether the reason logically supports the assertion or if it merely states another fact.

### Step 4: Conclusion
Based on the analysis:
- Both the assertion and the reason are true.
- However, the reason does not serve as a correct explanation for the assertion.

Thus, the correct answer is that both the assertion and reason are true, but the reason is not the correct explanation for the assertion.

**Final Answer:** Both assertion and reason are true, but the reason is not the correct explanation of the assertion.