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 determine which statement is incorrect regarding sex determination in organisms, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement 1**: "50% of male grasshoppers do not have a sex chromosome."
- Grasshoppers exhibit an XX-XY sex determination system, where females are XX and males are XO (where O represents the absence of a sex chromosome). Therefore, 50% of male grasshoppers do not have a sex chromosome (the O). This statement is **correct**.

2. **Statement 2**: "Usually the female birds make two types of gametes, which are based on sex chromosomes."
- In birds, the sex determination system is ZW for females and ZZ for males. Females produce two types of gametes: Z and W. This means that the sex of the offspring is determined by the type of gamete the female contributes. This statement is **correct**.

3. **Statement 3**: "Human males have one of their sex chromosomes which is smaller than the other."
- Human males have XY sex chromosomes, where the Y chromosome is indeed smaller than the X chromosome. This statement is **correct**.

4. **Statement 4**: "The sex of the progeny in the domesticated fowl depends on the type of sperm rather than the egg."
- In birds, specifically in domesticated fowl, the female is the heterogametic sex (ZW), and the male is homogametic (ZZ). The sex of the progeny actually depends on the type of egg (Z or W) produced by the female, not on the sperm. Therefore, this statement is **incorrect**.

### Conclusion:
The incorrect statement regarding sex determination in organisms is **Statement 4**.

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