Select the incorrect statement :

Options

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

Answer

To solve the question of selecting the incorrect statement, we will analyze each option provided:

1. **Human males have one of their sex chromosomes much shorter than the other.**
- In humans, males have one X chromosome and one Y chromosome. The Y chromosome is indeed much shorter than the X chromosome. Therefore, this statement is **correct**.

2. **Male fruit fly is heterogametic.**
- In fruit flies (Drosophila melanogaster), males have one X and one Y chromosome (XY), making them heterogametic. Hence, this statement is also **correct**.

3. **In male grasshopper, 50% of the sperms have sex chromosomes.**
- Grasshoppers have an XO sex determination system. Males are XO (having one X chromosome and no second sex chromosome), which means they can produce sperm with either the X chromosome or no sex chromosome at all. Therefore, this statement is **correct**.

4. **In domesticated quoll, sex of the progeny depends on the type of sperm rather than the egg.**
- In many species, including birds, the sex of the progeny is determined by the type of gamete contributed by the female (the egg). In the case of quolls, it is known that the sex determination is not solely dependent on the sperm. Therefore, this statement is **incorrect**.

Based on the analysis above, the incorrect statement is the fourth one.

### Final Answer:
The incorrect statement is: **In domesticated quoll, sex of the progeny depends on the type of sperm rather than the egg.**

---