Determination of percentage of crossing over between two linked genes is important in

Options

A. Maintaining heterozygosity in poplulation
B. Indication relative position of genes in chromosomes
C. Fixation of heterosos in organisms
D. Explaining the phenomenon of coupling and replusion

Answer

To determine the percentage of crossing over between two linked genes, we need to understand its significance in genetics. Here’s a step-by-step solution to the question:

### Step 1: Understanding Crossing Over
Crossing over is a genetic process that occurs during meiosis where homologous chromosomes exchange segments of genetic material. This results in new combinations of alleles in the offspring.

### Step 2: Importance of Crossing Over
The percentage of crossing over between two linked genes is crucial because it provides insights into the genetic linkage and the relative positions of those genes on a chromosome.

### Step 3: Analyzing the Options
We need to evaluate the given options:
1. **Maintaining heterozygosity in population** - This is not directly related to crossing over.
2. **Indication-relative position of genes in chromosomes** - This is relevant as crossing over frequency can indicate how far apart two genes are on a chromosome.
3. **Fixation of heterosomes in organisms** - This is not related to crossing over.
4. **Explaining the phenomena of coupling and repulsion** - While crossing over can relate to these phenomena, it is not the primary importance of determining crossing over percentages.

### Step 4: Conclusion
Based on the analysis, the correct answer is that the determination of the percentage of crossing over between two linked genes is important in **indicating the relative position of genes in chromosomes**.

### Final Answer:
**Indication-relative position of genes in chromosomes** (Option 2).

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