Assertion : Number of chromosomes in one genome is equal to number of linkage groups.
Reason : Linkage groups give important information about the location of genes in the chromosomes.

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.

Answer

To solve the assertion and reason question, we will analyze both statements step by step.

### Step 1: Analyze the Assertion
The assertion states: "The number of chromosomes in one genome is equal to the number of linkage groups."

- **Understanding Chromosomes and Linkage Groups**:
- A genome consists of all the genetic material in an organism, which includes all of its chromosomes.
- Linkage groups refer to genes that are located on the same chromosome and are inherited together due to their proximity.

### Step 2: Evaluate the Assertion
- In diploid organisms, each pair of homologous chromosomes represents a linkage group. Therefore, the number of chromosomes in a haploid set (n) corresponds to the number of linkage groups.
- For example, in humans (2n = 46), there are 23 pairs of chromosomes, which means there are 23 linkage groups.

**Conclusion for Assertion**: The assertion is true because the number of chromosomes in one genome (haploid or diploid) corresponds to the number of linkage groups.

### Step 3: Analyze the Reason
The reason states: "Linkage groups give important information about the location of genes in the chromosomes."

- **Understanding Linkage Groups**:
- Linkage groups are formed by genes that are physically close to each other on the same chromosome.
- The closer the genes are, the more likely they are to be inherited together, which is crucial for understanding genetic inheritance and mapping genes.

### Step 4: Evaluate the Reason
- The reason is also true because linkage groups indeed provide information about the arrangement of genes on chromosomes. This information is vital for genetic mapping and understanding inheritance patterns.

### Step 5: Conclusion
Both the assertion and reason are true, and the reason correctly explains the assertion. Therefore, the correct answer is that both statements are true, and the reason is a valid explanation for the assertion.

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