Sex-linked characters are

Options

A. Lethal
B. Recessive
C. Dominant
D. Dominant or recessive

Answer

**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). In humans, females have two X chromosomes (XX), while males have one X and one Y chromosome (XY).

2. **Types of Sex-Linked Traits:**
- These traits can be categorized based on their expression in the presence of alleles. They can be either dominant or recessive.

3. **Recessive Traits in Males:**
- Since males have only one X chromosome, any recessive allele present on that X chromosome will manifest as a trait or disorder. This is why many X-linked recessive disorders, such as hemophilia and muscular dystrophy, predominantly affect males.

4. **Y-Linked Traits:**
- Traits linked to the Y chromosome (Y-linked traits) are typically passed from father to son and are not present in females. Examples include azoospermia and retinitis pigmentosa.

5. **Conclusion:**
- Therefore, sex-linked characters can be either dominant or recessive. The correct answer to the question is that sex-linked characters are "dominant or recessive."

**Final Answer:**
Sex-linked characters are dominant or recessive.

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