Dominant epistasis is shown by

Options

A. Antirrhinum majus
B. Lathyrus odoratus
C. Mirabilis jalapa
D. None of the above

Answer

To determine which organism exhibits dominant epistasis, we first need to understand the concept of dominant epistasis and the characteristics of the organisms listed in the options.

### Step-by-Step Solution:

1. **Understanding Dominant Epistasis**:
- Dominant epistasis occurs when the presence of a dominant allele at one gene locus masks the expression of alleles at another locus. This phenomenon is typically observed in polygenic traits, where multiple genes contribute to a single phenotype.

2. **Identifying Polygenic Traits**:
- Polygenic traits are those controlled by more than one gene (usually three or more). Examples include skin color and height in humans.

3. **Analyzing the Options**:
- **Atirinum Magus**: This organism is associated with a single gene trait and does not exhibit polygenic inheritance. Therefore, it does not show dominant epistasis.
- **Lathyrus odoratus**: This organism is known for dihybrid crosses, which involve two genes. Since it does not involve more than two genes, it does not exhibit dominant epistasis.
- **Mirabilis jalapa**: Similar to Lathyrus odoratus, this flower also demonstrates a dihybrid cross and does not show dominant epistasis.

4. **Conclusion**:
- Since none of the provided options exhibit the characteristics of dominant epistasis (which requires polygenic traits), the correct answer is "none of the above."

### Final Answer:
None of the above options show dominant epistasis.