Dominant epistasis is shown by

Options

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

Answer

To solve the question regarding which organism exhibits dominant epistasis, we will analyze the options provided and understand the concept of dominant epistasis.

### Step-by-Step Solution:

1. **Understanding Dominant Epistasis**:
- Dominant epistasis is a genetic phenomenon where the presence of a dominant allele at one gene locus masks the expression of alleles at another locus. This results in a specific phenotypic ratio in the offspring.
- The typical phenotypic ratio associated with dominant epistasis is 12:3:1.

2. **Analyzing the Options**:
- **Option A: Antirrhinum majus**:
- This plant exhibits incomplete dominance, not dominant epistasis. The typical phenotypic ratio here is 1:2:1.
- **Option B: Lathyrus odoratus**:
- This plant follows the law of segregation and does not demonstrate dominant epistasis. The phenotypic ratio is 9:7.
- **Option C: Mirabilis jalapa**:
- This plant also shows incomplete dominance, similar to Antirrhinum majus, with a phenotypic ratio of 1:2:1.
- **Option D: None of the above**:
- Since none of the first three options exhibit dominant epistasis, this option becomes a candidate.

3. **Identifying the Correct Answer**:
- The question asks for an organism that shows dominant epistasis. Since none of the provided options (Antirrhinum majus, Lathyrus odoratus, Mirabilis jalapa) demonstrate this phenomenon, the correct answer is **None of the above**.

### Final Answer:
- The correct answer is **D: None of the above**.