Holandric genes are located on

Answer

**Step-by-Step Solution:**

1. **Understanding Holandric Genes:**
- Holandric genes are defined as genes that are located on the Y chromosome.

2. **Identifying the Chromosome:**
- Since holandric genes are specifically associated with males, it is important to note that they are found on the Y chromosome, which is present only in males in humans.

3. **Location on the Y Chromosome:**
- Holandric genes are located in the non-homologous portion of the Y chromosome. This means they are not paired with an equivalent chromosome in females, as females have two X chromosomes instead of a Y chromosome.

4. **Examples of Holandric Genes:**
- A common example of a holandric gene is the gene responsible for traits such as facial hair, which is expressed in males due to the presence of the Y chromosome.

5. **Final Answer:**
- Therefore, holandric genes are located on the Y chromosome.

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