Genes limited to only one sex are

Options

A. Genes of sex limited traits
B. X-linked genes
C. Sex incluenced genes
D. Holandric genes

Answer

To answer the question "Genes limited to only one sex are," we need to analyze the options provided and understand the definitions of each term.

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for genes that are expressed or limited to only one sex. This means we are looking for traits or genes that are not expressed in the opposite sex.

2. **Analyze the Options**:
- **X-linked Genes**: These are genes located on the X chromosome. While they can affect traits in both males and females, they are not limited to one sex. Therefore, this option is incorrect.

- **Holandric Genes**: These are genes located on the Y chromosome. They are expressed only in males since only males have a Y chromosome. This option could be a candidate, but it is limited to traits associated with the Y chromosome only.

- **Sex-influenced Genes**: These genes can be expressed in both sexes but may have different phenotypic effects depending on the sex. Thus, they are not limited to one sex. This option is incorrect.

- **Genes of Sex-limited Traits**: These are traits that are expressed in only one sex, regardless of whether the gene is present in both sexes. For example, certain traits in male animals (like antlers in deer) are not expressed in females. This option fits the definition of genes limited to one sex.

3. **Conclusion**: Based on the analysis of the options, the correct answer is **Genes of Sex-limited Traits**.

### Final Answer:
**Genes limited to only one sex are Genes of Sex-limited Traits.**

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