Heterogamety or formation of two types of gametes is found in

Options

A. Male Drosphila
B. Female bird
C. Female Drospophila
D. Both A and B

Answer

To answer the question regarding heterogamety or the formation of two types of gametes, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Heterogamety**:
- Heterogamety refers to the production of two different types of gametes by an organism. This can occur in males or females depending on the species.

2. **Identifying Male Heterogamety**:
- In males, heterogamety is commonly seen in certain organisms like Drosophila (fruit flies) and humans. Males typically produce two types of gametes: one with an X chromosome and one with a Y chromosome (XY system).

3. **Identifying Female Heterogamety**:
- In females, heterogamety is observed in species such as birds, butterflies, and some reptiles. In these organisms, females typically produce two types of gametes: one with a Z chromosome and one with a W chromosome (ZW system).

4. **Analyzing the Options**:
- **Option A**: Male Drosophila - Correct, as males produce X and Y gametes.
- **Option B**: Female birds - Correct, as females produce Z and W gametes.
- **Option C**: Female Drosophila - Incorrect, as females produce only X gametes.
- **Option D**: Both A and B - Correct, since both male Drosophila and female birds exhibit heterogamety.

5. **Conclusion**:
- The correct answer to the question is **Option D: Both A and B**.