Complementary genes were demonstrated by Bateson and Punnet in

Options

A. Capsella
B. Lathyrus odoratus
C. Antirrhinum
D. Mirabilis

Answer

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks which plant was used by Bateson and Punnett to demonstrate complementary genes.

2. **Recall Relevant Information**: Bateson and Punnett conducted experiments on flower color in plants to study the inheritance patterns of complementary genes.

3. **Determine the Correct Plant**: The plant in which they demonstrated complementary genes is *Lathyrus odoratus*, commonly known as the sweet pea.

4. **Understand Complementary Genes**: Complementary genes are non-allelic genes that work together to produce a specific phenotype. In this case, the presence of both dominant alleles (C and P) results in purple flowers, while the absence of either or both leads to white flowers.

5. **Analyze the Genetic Ratios**: In the case of sweet peas, when the F1 hybrid (CcPp) is selfed, the resulting phenotypic ratio is 9:7. This means:
- 9 plants exhibit purple flowers (presence of both dominant alleles).
- 7 plants exhibit white flowers (due to the presence of either one or no dominant alleles).

6. **Conclude the Answer**: Therefore, the correct answer to the question is *Lathyrus odoratus*.

**Final Answer**: Complementary genes were demonstrated by Bateson and Punnett in *Lathyrus odoratus* (sweet pea).

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