All sex limited traits, except

Options

A. Beard in man
B. Porcupine skin
C. Antlers in male deer
D. Brilliant plumage in peacock

Answer

### Step-by-Step Solution:

1. **Understanding Sex-Limited Traits**:
- Sex-limited traits are characteristics that are expressed in only one sex, either male or female. This means that even if the genes for these traits are present in both sexes, they are only phenotypically visible in one.

2. **Analyzing the Options**:
- The question asks to identify which of the given traits is **not** a sex-limited trait.

3. **Option Analysis**:
- **Bears in Men**:
- Beards are influenced by testosterone and are only found in males. Thus, this is a sex-limited trait.
- **Porcupine Skin**:
- Porcupine skin characteristics can be present in both males and females. This trait is autosomal dominant, meaning it can manifest in both sexes. Therefore, this is **not** a sex-limited trait.
- **Antlers in Male Deer**:
- Antlers are typically found only in male deer and are influenced by hormonal factors. Hence, this is a sex-limited trait.
- **Brilliant Plumage in Peacocks**:
- The brilliant plumage is a characteristic found only in male peacocks. Thus, this is also a sex-limited trait.

4. **Conclusion**:
- The only option that is not a sex-limited trait is **Porcupine Skin**.

### Final Answer:
**Porcupine Skin** is the trait that is not sex-limited.

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