Which one of the following generates new genetic combinations leading to variation ?

Options

A. Vegetative reproduction
B. Parthenogenesis
C. Sexual reproduction
D. Nucellular polyembryony

Answer

To answer the question "Which one of the following generates new genetic combinations leading to variation?" we will analyze the options provided: vegetative reproduction, parthenogenesis, sexual reproduction, and nuclear polyembryony.

### Step-by-Step Solution:

1. **Understanding Genetic Variation**:
- Genetic variation refers to the differences in the genetic makeup of individuals within a population. This variation is crucial for evolution and adaptation.

2. **Analyzing the Options**:
- **Vegetative Reproduction**: This is a form of asexual reproduction where new individuals are produced from the vegetative parts of a plant (like roots, stems, or leaves). This method does not involve the mixing of genetic material from two parents, hence it does not generate genetic variation.

- **Parthenogenesis**: This is a form of asexual reproduction where an egg develops into an individual without fertilization. While it can lead to offspring, they are genetically identical to the parent, thus not contributing to genetic variation.

- **Sexual Reproduction**: This involves the fusion of male and female gametes (sperm and egg). The offspring receive a mix of genes from both parents, leading to new genetic combinations. This process is a significant source of genetic variation in sexually reproducing organisms.

- **Nuclear Polyembryony**: This refers to the formation of multiple embryos from a single fertilized egg. While it can produce genetically different individuals, it does not typically lead to the same level of genetic variation as sexual reproduction since the embryos originate from the same zygote.

3. **Conclusion**:
- Among the options provided, **sexual reproduction** is the process that generates new genetic combinations leading to variation. This is due to the combination of genetic material from two parents, resulting in offspring that are genetically unique.

### Final Answer:
**Sexual reproduction generates new genetic combinations leading to variation.**

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