Select the incorrect statement.

Options

A. Male fruit fly is heterogametic.
B. In male grasshoppers, 50% of sperms have no sex-chromosome.
C. In domesticated fowls sex of progeny depends on the type of sperm rather than egg.
D. Human males have one of their sex-chromosome much shorter than the other.

Answer

To solve the question of selecting the incorrect statement, we will analyze each of the provided statements step by step.

### Step 1: Analyze the First Statement
**Statement:** Male fruit fly is heterogametic.

- **Explanation:** Male fruit flies (Drosophila melanogaster) have XY sex chromosomes. This means they produce two types of gametes: one with the X chromosome and one with the Y chromosome. Therefore, they are indeed heterogametic.

**Conclusion:** This statement is **correct**.

### Step 2: Analyze the Second Statement
**Statement:** In male grasshoppers, 50% of sperm has no sex chromosome.

- **Explanation:** Male grasshoppers have an XO sex determination system. This means that half of their sperm will carry the X chromosome, while the other half will have no sex chromosome at all (O). Thus, this statement is also **correct**.

**Conclusion:** This statement is **correct**.

### Step 3: Analyze the Third Statement
**Statement:** In domesticated fowls, the sex of progeny depends on the type of sperm rather than the egg.

- **Explanation:** In domesticated fowls (chickens), the females are ZW (heterogametic) and the males are ZZ (homozygous). The sex of the progeny is determined by the type of sperm (Z or W) that fertilizes the egg. Thus, this statement is **correct**.

**Conclusion:** This statement is **correct**.

### Step 4: Identify the Incorrect Statement
After analyzing all three statements, we find that:

1. Male fruit fly is heterogametic - **Correct**
2. In male grasshoppers, 50% of sperm has no sex chromosome - **Correct**
3. In domesticated fowls, the sex of progeny depends on the type of sperm rather than the egg - **Correct**

However, the question asks for the **incorrect statement**. Since all statements provided are correct, it seems there might be a misunderstanding in the interpretation of the statements.

### Final Conclusion
Based on the analysis, the answer to the question is that all the statements provided are correct, and there is no incorrect statement among the options given.