Sex-limited and sex-linked genes are located on:

Options

A. Autosomes
B. X-chromosome
C. Y-chromosome
D. Both (b) and (c )

Answer

To answer the question regarding the location of sex-limited and sex-linked genes, we can break down the concepts step by step.

### Step-by-Step Solution:

1. **Understanding Sex-Limited Genes**:
- Sex-limited genes are those that are present in both males and females but are expressed in only one sex.
- For example, certain traits may only be visible in males even though the genes for those traits are present in both genders.

2. **Understanding Sex-Linked Genes**:
- Sex-linked genes are located on the sex chromosomes, which in humans are the X and Y chromosomes.
- These genes can be responsible for traits that are inherited differently in males and females due to the presence of the Y chromosome in males and the X chromosome in both sexes.

3. **Location of Genes**:
- Sex-limited genes can be found on autosomes (non-sex chromosomes) as well as on sex chromosomes. However, their expression is limited to one sex.
- Sex-linked genes are specifically located on the X and Y chromosomes. In humans, most sex-linked traits are associated with the X chromosome because it carries more genes than the Y chromosome.

4. **Conclusion**:
- Therefore, the correct answer to the question is that sex-limited genes can be located on autosomes or sex chromosomes, while sex-linked genes are located on both the X and Y chromosomes.
- The final answer is that sex-limited and sex-linked genes are located on both B (X chromosome) and C (Y chromosome).

### Final Answer:
Both B and C (i.e., X chromosome and Y chromosome).