All genes located on the same chromosome:-

Options

A. form different groups depending upon their relative distance
B. form one linkage group
C. will not form any linkage groups
D. form interactive groups that affect the phenotype

Answer

To answer the question "All genes located on the same chromosome:", we need to analyze the options provided and understand the concept of linkage groups in genetics.

### Step-by-Step Solution:

1. **Understanding Linkage Groups**:
- Genes that are located on the same chromosome tend to be inherited together. This is because they are physically linked on the chromosome and are less likely to be separated during meiosis unless crossing over occurs.

2. **Identifying the Correct Concept**:
- When genes are closely located on the same chromosome, they form what is known as a "linkage group." This means that these genes are linked together and tend to be passed on as a unit to the next generation.

3. **Considering Crossing Over**:
- If crossing over does not occur, the alleles of these linked genes will be inherited together, maintaining parental combinations in the offspring. However, if crossing over occurs, it can separate these linked genes, leading to new combinations of traits.

4. **Evaluating the Options**:
- The options provided likely include terms such as "linkage group," "interactive group," and others. Based on our understanding, the correct answer must refer to the concept of linkage groups.

5. **Selecting the Correct Answer**:
- Since the question asks about genes located on the same chromosome, the correct answer is that they form a "linkage group."

### Final Answer:
- All genes located on the same chromosome form a **linkage group**.