Development of purple flower character when two white flower strains of sweet pea are crossed, is an example of

Options

A. multiple factor inheritance
B. multiple allele inheritance
C. supplementary genes and gene interaction
D. complementary genes and gene interaction

Explanation

**Step-by-Step Solution:**

1. **Understanding the Cross**: The question states that two white flower strains of sweet pea are crossed, resulting in the development of a purple flower character. This indicates that the purple flower trait is being expressed in the offspring.

2. **Identifying the Traits**: In this scenario, we have two traits: white flowers (which are the parental traits) and purple flowers (which are the offspring trait). The fact that the purple flower appears suggests that it is a dominant trait.

3. **Applying Mendel’s Laws**: According to Mendel's laws of inheritance, particularly the law of dominance, when two different traits are crossed, the dominant trait will mask the recessive trait. In this case, the purple flower trait is dominant over the white flower trait.

4. **Complementary Genes**: The development of the purple flower character can also be explained by the concept of complementary genes, where two different genes contribute to the expression of a single trait. In this case, the interaction between the alleles of the genes results in the purple flower phenotype being expressed.

5. **Conclusion**: Therefore, the development of the purple flower character when two white flower strains of sweet pea are crossed is an example of complementary genes and gene interaction.

**Final Answer**: The correct answer is that this is an example of complementary genes and gene interaction.

---