A linear graphic representation of the sequence and relative distances of the various genes present in a chromosome is

Options

A. linkage map or chromosomal map
B. genetic map or linkage map
C. chromosomal map or genetic map
D. chromosomal map or genetic map or linkage map

Answer

To solve the question regarding the linear graphic representation of the sequence and relative distances of various genes present in a chromosome, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding Chromosomal Mapping**:
- Chromosomal mapping involves creating a visual representation of the genes located on a chromosome. This representation shows the order of genes and the distances between them.

2. **Types of Maps**:
- There are different types of maps that serve this purpose:
- **Genetic Map**: This type of map shows the relative positions of genes based on genetic linkage and recombination frequencies.
- **Linkage Map**: This is a specific type of genetic map that focuses on the linkage between genes on the same chromosome, indicating how closely they are inherited together.
- **Chromosomal Map**: This is a broader term that encompasses both genetic and linkage maps, showing the overall layout of genes on a chromosome.

3. **Identifying the Correct Answer**:
- The question asks for a linear graphic representation of the sequence and relative distances of various genes. The terms "chromosomal map," "genetic map," and "linkage map" all refer to this type of representation.
- Therefore, the correct answer to the question is **D**, which includes all three types of maps.

### Final Answer:
The linear graphic representation of the sequence and relative distances of various genes present in a chromosome is referred to as a **chromosomal map**, **genetic map**, and **linkage map**. Thus, the correct option is **D**.