The sex linked characters are those

Options

A. Which are related to sexual physiology
B. The genes of which are present on the sex chromosomes
C. Which appear either in male or in female
D. Which are controlled by sex hormones

Answer

To answer the question "The sex linked characters are those," we need to analyze the options provided and determine which one accurately describes sex-linked characters.

### Step-by-Step Solution:

1. **Understanding Sex Linked Characters**:
- Sex-linked characters are traits that are associated with genes located on the sex chromosomes (X and Y chromosomes).

2. **Evaluating Option 1**:
- Option 1 states that sex-linked characters are related to sexual physiology.
- This is incorrect because while sexual physiology involves hormones (like FSH, LH, Testosterone, and Estrogen), these hormones are not sex-linked characters themselves.

3. **Evaluating Option 2**:
- Option 2 claims that sex-linked characters are the genes which are present on sex chromosomes.
- This is correct because sex-linked traits are indeed determined by genes located on the X or Y chromosomes.

4. **Evaluating Option 3**:
- Option 3 suggests that sex-linked characters appear either in males or females.
- This is incorrect, as sex-linked traits can manifest in both sexes, although they may express differently due to the presence of one or two X chromosomes.

5. **Evaluating Option 4**:
- Option 4 states that sex-linked characters are controlled by sex hormones.
- This is also incorrect because sex-linked traits are determined by the genes on the sex chromosomes, not directly by sex hormones.

6. **Conclusion**:
- After evaluating all options, the correct answer is Option 2: "the genes which are present on sex chromosome."

### Final Answer:
The sex linked characters are those **genes which are present on sex chromosome** (Option 2).

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