Sexual reproduction involves formation of the male and female gametes by

Options

A. Same individual
B. Different individuals of the opposite sex
C. Different individuals of the same sex
D. Either (1) or (2)

Answer

### Step-by-Step Solution:

1. **Understanding Gametes**:
- Gametes are the reproductive cells involved in sexual reproduction. They are specialized cells that fuse during fertilization to form a zygote, which develops into a new organism.

2. **Types of Gametes**:
- There are two types of gametes: male gametes (sperm) and female gametes (eggs or ova).
- The male gamete (sperm) is typically smaller, motile (able to move), and has a flagellum (tail) that helps it swim towards the female gamete.
- The female gamete (egg) is larger, non-motile, and provides the necessary nutrients for the developing zygote.

3. **Formation of Gametes**:
- In sexual reproduction, male and female gametes are produced by different individuals of the opposite sex. This means that the male and female gametes come from two distinct organisms.

4. **Options Analysis**:
- The options provided were:
- Same individual
- Different individuals of the opposite sex
- Different individuals of the same sex
- Either one or two
- The correct answer is "different individuals of the opposite sex" because sexual reproduction requires the fusion of male and female gametes, which come from separate individuals.

5. **Conclusion**:
- Therefore, sexual reproduction involves the formation of male and female gametes by different individuals of the opposite sex.