The genes, which remains confined to differential region of Y-chromosome, are

Options

A. Autosomal genes
B. Holandric genes
C. Corpletely sex-linked genes
D. Mutant genes

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the genes that are specifically located in the differential region of the Y chromosome.

2. **Identifying Key Terms**: The terms mentioned in the options are:
- Autosomal genes
- Holandric genes
- Completely sex-linked genes
- Mutant genes

3. **Defining Holandric Genes**: Holandric genes are those that are located on the Y chromosome and are passed from father to son. These genes are confined to the differential region of the Y chromosome.

4. **Differential Region of Y Chromosome**: The differential region of the Y chromosome refers to the part that is not homologous with the X chromosome. This region does not undergo crossing over during meiosis.

5. **Inheritance Patterns**: Traits located in the differential regions of the X and Y chromosomes exhibit different inheritance patterns compared to autosomal genes. Y-linked traits (holandric traits) are typically expressed only in males.

6. **Conclusion**: Based on the definitions and characteristics discussed, the genes that remain confined to the differential region of the Y chromosome are known as holandric genes.

**Final Answer**: The genes that remain confined to the differential region of the Y chromosome are called holandric genes.

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