Distinguish between a gamete and zygote. Explain their roles in sexual reproduction.

Explanation

### Step-by-Step Solution

1. **Definition of Gamete:**
- A gamete is a reproductive cell that is involved in sexual reproduction. It is a haploid cell, meaning it contains only one set of chromosomes (n). In humans, for example, male gametes are sperm cells, and female gametes are egg cells (ova).

2. **Definition of Zygote:**
- A zygote is the cell formed when two gametes (one from each parent) fuse during fertilization. It is a diploid cell, meaning it contains two sets of chromosomes (2n), one set from each parent.

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