Which of the following is incorrect in relation to sex determination in organisms?

Options

A. In male grasshopper , 50% of the sperms have no sex chromosome
B. Usually, female birds produce two type of gametes based on sex chromosome.
C. The human males have one of their sex chromosome much shorter than other.
D. In domesticated fowls, the sex of the progeny depends on the type
of sperm rather than the egg

Answer

To solve the question regarding which statement is incorrect in relation to sex determination in organisms, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Understanding Sex Determination**:
- Sex determination is the biological process that determines the sex of an organism, typically based on the combination of sex chromosomes inherited from the parents.

2. **Analyzing Each Statement**:
- **Statement A**: "In male grasshopper, 50% of the sperms have no sex chromosome."
- Grasshoppers exhibit an XXXO type of sex determination. Males are represented as XO, meaning they have one X chromosome and no second sex chromosome. Therefore, 50% of male grasshopper sperm will carry the X chromosome, and 50% will have no sex chromosome.
- **Conclusion**: This statement is correct.

- **Statement B**: "Usually female birds produce two types of gametes based on sex chromosome."
- Birds are heterogametic, meaning females produce two types of gametes: one with a Z chromosome and one with a W chromosome. Males, on the other hand, produce only Z gametes.
- **Conclusion**: This statement is correct.

- **Statement C**: "The human males have one of their sex chromosomes much shorter than Y chromosome."
- In humans, males have one X and one Y chromosome. The X chromosome is larger than the Y chromosome, making this statement true.
- **Conclusion**: This statement is correct.

- **Statement D**: "In domesticated fowls, the sex of the progeny depends on the type of sperm rather than the egg."
- In domesticated fowls, the females are ZW (heterogametic) and males are ZZ (homogametic). The sex of the progeny is determined by the type of egg (ZW from the female) rather than the sperm. Therefore, this statement is incorrect.
- **Conclusion**: This statement is incorrect.

3. **Final Answer**: The incorrect statement is **D**.