The fusion of patemal and maternal sets of chromosomes of haploid gameles is called .........

Explanation

**Step-by-Step Solution:**

1. **Understanding Gametes**: Recognize that gametes are haploid cells, meaning they contain one set of chromosomes. In humans, the male gamete is the sperm, and the female gamete is the ovum (egg).

2. **Chromosome Sets**: Each gamete contributes one set of chromosomes. The sperm carries the paternal set, while the ovum carries the maternal set.

3. **Fertilization Process**: When a sperm fertilizes an ovum, the two haploid sets of chromosomes combine. This process is known as fertilization.

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