Consider the following statements regarding linkage
(i) The linked genes are located on the same chromosome.
(ii) Crossing over between linked genes is maximum.
(iii) The linkage can be broken by crossing over.
(iv) Linkage is against Mendel's law of segregation.

Options

A. (i) and (iii) are correct
B. (i) and (ii) are correct
C. (ii), (iii) and (iv) are correct
D. (i), (iii) and (iv) are correct

Answer

To solve the question regarding the statements about linkage, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement (i): The linked genes are located on the same chromosome.**
- This statement is **correct**. Linked genes are indeed located on the same chromosome. They tend to be inherited together because they are physically close to each other on the chromosome.

**Hint:** Remember that linkage refers to genes that are on the same chromosome and tend to be inherited together.

2. **Statement (ii): Crossing over between linked genes is maximum.**
- This statement is **incorrect**. Crossing over occurs between linked genes, but it is not maximum. The closer the genes are on a chromosome, the less likely they are to undergo crossing over. Therefore, the frequency of crossing over decreases with closer linkage.

**Hint:** Consider how the distance between genes affects the likelihood of crossing over.

3. **Statement (iii): The linkage can be broken by crossing over.**
- This statement is **correct**. Crossing over can break the linkage between genes by exchanging segments of chromatids during meiosis. This results in new combinations of alleles.

**Hint:** Think about how genetic recombination during meiosis can alter the combinations of alleles.

4. **Statement (iv): Linkage is against Mendel's law of segregation.**
- This statement is **incorrect**. Linkage does not contradict Mendel's law of segregation; rather, it influences the patterns of inheritance. Mendel's law of segregation states that alleles segregate independently during gamete formation, but linked genes can affect the inheritance patterns.

**Hint:** Reflect on how linkage interacts with Mendel's principles rather than opposing them.

### Conclusion:
Based on the analysis:
- **Correct Statements:** (i) and (iii)
- **Incorrect Statements:** (ii) and (iv)

Thus, the correct answer is that statements (i) and (iii) are true regarding linkage.

### Final Answer:
The correct statements regarding linkage are (i) and (iii).