Location of a particular gene on sex chromosome or autosomes can be identified by -

Options

A. Test cross
B. Out cross
C. Back cross
D. Reciprocal cross

Answer

To determine the location of a particular gene on sex chromosomes or autosomes, we can analyze the options provided in the question step by step:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks how to identify the location of a gene on sex chromosomes or autosomes. This involves understanding different types of genetic crosses and their purposes.

2. **Option A: Test Cross**:
- A test cross involves breeding an individual with an unknown genotype with a homozygous recessive individual. This method is primarily used to determine the genotype of the unknown individual, not to identify the location of a gene on chromosomes.
- **Conclusion**: This option is incorrect.

3. **Option B: Out Cross**:
- An out cross refers to mating between unrelated individuals. This method does not provide information about the specific location of genes on chromosomes, as it does not involve any genetic mapping or identification of gene locations.
- **Conclusion**: This option is also incorrect.

4. **Option C: Back Cross**:
- A back cross is the mating of a hybrid organism with one of its parents or an organism with a similar genotype. While this can be useful for certain genetic studies, it does not specifically help in identifying the location of a gene on sex chromosomes or autosomes.
- **Conclusion**: This option is incorrect as well.

5. **Option D: Reciprocal Cross**:
- A reciprocal cross involves crossing two individuals in both possible combinations (e.g., A x B and B x A). This method allows researchers to observe the inheritance patterns of traits and can help identify whether a gene is located on a sex chromosome or an autosome. By analyzing the offspring from both crosses, one can infer the location of the gene.
- **Conclusion**: This option is correct.

### Final Answer:
The correct answer is **Reciprocal Cross**.

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