_____ incompatibility promotes cross pollination.

Options

A. Inbreeding
B. Intraspecific
C. Outbreeding
D. Interspecific

Answer

**Step-by-Step Solution:**

1. **Understanding Incompatibility**: The question asks about a type of incompatibility that promotes cross-pollination. Incompatibility refers to the inability of certain pollen to fertilize ovules of the same species, which can lead to cross-pollination.

2. **Identifying Types of Incompatibility**: There are different types of incompatibility, including self-incompatibility and inbreeding. Self-incompatibility prevents self-fertilization, thereby promoting cross-pollination.

3. **Exploring Inbreeding**: Inbreeding is the mating of closely related individuals. This process tends to promote self-pollination rather than cross-pollination, as it involves the same genetic material.

4. **Defining Cross-Pollination**: Cross-pollination occurs when pollen from one individual fertilizes the ovule of another individual, which can happen between different species (inter-specific) or different individuals of the same species (intra-specific).

5. **Conclusion**: The type of incompatibility that promotes cross-pollination is self-incompatibility. By preventing self-fertilization, it encourages the mixing of genetic material from different individuals, leading to healthier and more diverse offspring.

**Final Answer**: Self-incompatibility promotes cross-pollination.

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