Genes or alleles which can express independently when they are present together and also follow the law of segregation are -

Options

A. Multiple genes
B. Codominant genes
C. Epistatic genes
D. Complementary genes

Answer

To solve the question regarding the type of genes or alleles that can express independently when present together and also follow the law of segregation, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for genes or alleles that can express independently when present together and also adhere to the law of segregation.

2. **Identifying Key Terms**:
- **Law of Segregation**: This law states that during the formation of gametes, the alleles for a trait segregate from each other so that each gamete carries only one allele for each gene.
- **Independent Expression**: This refers to the ability of different alleles to express their traits without affecting each other.

3. **Analyzing the Options**:
- **Multiple Genes**: These are genes that can express independently. A classic example is the human blood group system, where alleles IA and IB can coexist and express independently.
- **Co-dominant Genes**: These genes express together, resulting in a phenotype that shows both traits (e.g., red and white flowers producing pink).
- **Epistatic Genes**: These genes mask the expression of other genes, which does not align with independent expression.
- **Complementary Genes**: These require both genes to be present for expression, which does not fit the definition of independent expression.

4. **Conclusion**: Based on the definitions and examples analyzed, the correct answer is **multiple genes**. These genes can express independently and follow the law of segregation.

### Final Answer:
**Multiple Genes**

---