How many eggs and sperms are required to produce fraternal twins ?

Options

A. One egg, one sperm
B. One egg, two sperm
C. Two eggs, one sperm
D. Two eggs, two sperms

Answer

To determine how many eggs and sperms are required to produce fraternal twins, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Fraternal Twins**:
- Fraternal twins, also known as dizygotic twins, occur when two separate eggs are fertilized by two different sperm cells. This results in the formation of two distinct zygotes.

2. **Egg Production**:
- Typically, during a menstrual cycle, a woman's ovary releases one egg (ovum). However, in some cases, both ovaries can release an egg in the same cycle.

3. **Fertilization Process**:
- For fraternal twins to occur, two eggs must be released and each egg must be fertilized by a different sperm. This means that two sperm cells are needed.

4. **Formation of Zygotes**:
- Each fertilized egg (ovum) develops into a zygote. Since there are two eggs and they are fertilized by two different sperm, two zygotes are formed.

5. **Conclusion**:
- Therefore, to produce fraternal twins, a total of **2 eggs and 2 sperm cells** are required.

### Final Answer:
**2 eggs and 2 sperm cells are required to produce fraternal twins.**

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