Select the correct statements from the ones given below with respect to linkage and recombination

Options

A. Tightly linked genes on the same chromosome show higher recombinations
B. Genes far apart on the same chromosome show very few recombinations
C. Genes loosely linked on the same chromosome show similar recombinations as the tightly linked ones
D. Tightly linked genes on the same chromosome show very few recombination

Answer

To solve the question regarding linkage and recombination, we need to analyze the statements provided and determine their correctness based on the principles of genetics.

### Step-by-Step Solution:

1. **Understanding Linkage**:
- Linkage refers to the tendency of genes that are located close to each other on a chromosome to be inherited together during meiosis. This is because they are less likely to be separated by crossing over.

**Hint**: Remember that genes that are close together on a chromosome are less likely to be separated during meiosis.

2. **Analyzing the First Statement**:
- The first statement claims that "tightly linked genes on the chromosome show higher recombination." This is incorrect because tightly linked genes are less likely to undergo recombination due to their proximity.

**Hint**: Think about how proximity affects the likelihood of crossing over.

3. **Analyzing the Second Statement**:
- The second statement says "genes far apart on the same chromosome show very few recombinations." This is also incorrect. In fact, genes that are far apart are more likely to be separated by recombination.

**Hint**: Consider how distance between genes influences recombination frequency.

4. **Analyzing the Third Statement**:
- The third statement suggests that "genes which are loosely linked on the same chromosome show similar combinations as the tightly linked genes." This is incorrect as well. Loosely linked genes will show a higher frequency of recombination compared to tightly linked genes.

**Hint**: Compare the recombination frequencies of tightly linked versus loosely linked genes.

5. **Analyzing the Fourth Statement**:
- The fourth statement states that "tightly linked genes on the same chromosome show very few recombinations." This statement is correct. Tightly linked genes are inherited together as a single unit with very few chances of crossing over occurring between them.

**Hint**: Focus on the definition of tightly linked genes and their behavior during meiosis.

### Conclusion:
Based on the analysis, the correct statement is the fourth one: "tightly linked genes on the same chromosome show very few recombinations."

### Summary of Correct Statement:
- **Correct Statement**: Tightly linked genes on the same chromosome show very few recombinations.