Genetic map is one that

Options

A. establishes sites of the genes on a chromosome
B. establishes the various stages in gene evolution
C. shows the stags during the cell division
D. shows the distribution of various species in a region

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the definition of a genetic map and what it establishes.

2. **Identifying the Options**: The options provided are:
- A) Establishes sites of the genes on a chromosome
- B) Establishes the various stages in gene evolution
- C) Shows the stages during cell division
- D) Shows the distribution of various species in a region

3. **Defining Genetic Mapping**: Genetic mapping is a method used to determine the location and relative distances between genes on a chromosome. It helps in identifying where genes are located within the genome.

4. **Essence of Genetic Mapping**: The primary goal of genetic mapping is to place a collection of molecular markers onto their respective positions on the chromosomes. This allows researchers to understand the arrangement of genes and their distances from one another.

5. **Evaluating the Options**:
- Option A correctly states that a genetic map establishes the sites of genes on a chromosome.
- Option B is incorrect as it refers to gene evolution, which is not the primary focus of genetic mapping.
- Option C is also incorrect since it pertains to cell division, not gene mapping.
- Option D is unrelated to genetic mapping as it discusses species distribution.

6. **Conclusion**: Based on the definitions and evaluations, the correct answer is **Option A**: "Establishes sites of the genes on a chromosome."

---