In which female has a pair of XX chromosomes

Options

A. Drosophila
B. Butterfly
C. Bulbul
D. Peafowl

Answer

### Step-by-Step Solution:

1. **Understanding Chromosomal Sex Determination**:
- In many organisms, sex is determined by specific combinations of sex chromosomes. In humans and Drosophila (fruit flies), females typically have two X chromosomes (XX), while males have one X and one Y chromosome (XY).

2. **Identifying the Female with XX Chromosomes**:
- The question asks for a female that has a pair of XX chromosomes. In the context of the organisms mentioned, we can identify that both humans and Drosophila have XX females.

3. **Homogametic vs. Heterogametic**:
- Females with XX chromosomes are termed homogametic because they can only produce one type of gamete (X). In contrast, males (XY) are heterogametic as they produce two types of gametes (X and Y).

4. **Examining Other Organisms**:
- The transcript mentions other organisms like butterflies and birds. In butterflies, the sex determination is ZW for females and ZZ for males, indicating that females are heterogametic (ZW). In birds, females are also heterogametic (ZW), while males are homogametic (ZZ).

5. **Conclusion**:
- Based on the information provided, the correct answer to the question "In which female has a pair of XX chromosomes?" is Drosophila, as it is a well-known example of an organism where females are XX and males are XY.

### Final Answer:
The female that has a pair of XX chromosomes is **Drosophila**.

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