Unit of distance between genes in a chromosome is known as

Options

A. C-DNA
B. Morgan
C. Centimorgan
D. Spacer

Explanation

To solve the question regarding the unit of distance between genes in a chromosome, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the specific unit used to measure the distance between genes located on a chromosome.

2. **Identifying Possible Options**: The options provided are:
- a) cDNA
- b) Morgan
- c) Centimorgan
- d) Spacer

3. **Analyzing Each Option**:
- **cDNA**: This stands for complementary DNA, which is not related to the measurement of distance between genes. Thus, this option is incorrect.
- **Morgan**: This is a unit of genetic linkage, but it represents a larger distance than centimorgan. One Morgan corresponds to a 100% chance of crossover. Therefore, this option is also incorrect.
- **Centimorgan (cM)**: This is defined as the distance between chromosome positions for which the expected average number of chromosomal crossovers is 1%. This is indeed the correct unit for measuring genetic linkage.
- **Spacer**: This term does not refer to a unit of genetic distance and is therefore incorrect.

4. **Conclusion**: The correct answer is **Centimorgan (cM)**, which is the unit of distance between genes in a chromosome.

### Final Answer:
The unit of distance between genes in a chromosome is known as **Centimorgan (cM)**.

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