Heterozygosity is produced following

Options

A. Xenogamy
B. Geitonogamy
C. Autogamy
D. Cleistogamy.

Answer

**Step-by-Step Solution:**

1. **Understanding Heterozygosity**:
- Heterozygosity refers to the genetic condition where an individual has two different alleles at a specific gene locus. This variation is crucial for genetic diversity and adaptability.

2. **Analyzing the Options**:
- The question provides four options related to types of pollination:
1. Xenogamy
2. Ketonogamy (likely a typo for "Pteronogamy")
3. Autogamy
4. Clistogamy

3. **Defining Each Option**:
- **Xenogamy**: This is cross-pollination between flowers of different plants. It introduces genetic variation by combining alleles from different genetic backgrounds.
- **Pteronogamy**: This is a type of self-pollination where pollen is transferred from the anther of one flower to the stigma of another flower on the same plant. It does not introduce new alleles from different plants.
- **Autogamy**: This is also a form of self-pollination where pollen from the same flower fertilizes its ovules. It maintains the same genetic makeup and does not create heterozygosity.
- **Clistogamy**: In this type, flowers do not open, and self-pollination occurs. It also results in no introduction of new alleles.

4. **Conclusion**:
- Among the options, only **Xenogamy** involves the transfer of pollen between different plants, which leads to the combination of different alleles and thus produces heterozygosity. The other options involve self-pollination, which does not create genetic diversity.

5. **Final Answer**:
- Heterozygosity is produced following **Xenogamy**.

---