Identify correct statement w.r.t. fruit fly.

Options

A. Chromosomal theory of inheritance was proposed by using it
B. Shows ZO-ZZ type of sex determination
C. Recombination between white eye and miniature wings was `37.2%`
D. more than one option is correct

Answer

To solve the question "Identify the correct statement with respect to the fruit fly," we will analyze each of the provided statements step-by-step.

### Step-by-Step Solution:

1. **Understanding the Fruit Fly**:
- The scientific name of the fruit fly is **Drosophila melanogaster**. This organism is widely used in genetic studies.

2. **Evaluating the First Statement**:
- The first statement claims that the **chromosomal theory of inheritance was proposed by using it** (Drosophila).
- This statement is **incorrect**. The chromosomal theory of inheritance was proposed by scientists **Sutton and Boveri**, not specifically through Drosophila. However, Drosophila was used by **Thomas Hunt Morgan** to study linkage, which is related but distinct.

3. **Evaluating the Second Statement**:
- The second statement states that Drosophila shows **ZZ/ZW type of sex determination**.
- This statement is also **incorrect**. Drosophila exhibits **XY type of sex determination**, where males have one X and one Y chromosome, and females have two X chromosomes.

4. **Evaluating the Third Statement**:
- The third statement mentions that the **recombination between white eye and miniature wings was 37.2%**.
- This statement is **correct**. In Morgan's experiments with Drosophila, he found that the recombination frequency between the genes for white eyes and miniature wings was indeed around 37.2%. This is a result of genetic linkage and recombination during meiosis.

5. **Evaluating the Fourth Statement**:
- The fourth statement claims that **more than one option is correct**.
- Since only the third statement is correct, this statement is **incorrect**.

### Conclusion:
The correct statement with respect to the fruit fly is the **third statement**: "Recombination between white eye and miniature wings was 37.2%."

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