Which of the following statements is incorrect regarding sex determination in animals?

Options

A. Grasshoppers , male = autosomes + XO, female - autosomes +XX
B. Drosophila, males = autosomes + XY, female = autosomes +XX
C. Birds , females = autosomes + ZW, males = autosomes + ZZ
D. Insects (XO type), all sperms = one set of autosomes + X

Answer

To solve the question regarding which statement is incorrect about sex determination in animals, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding Sex Determination**:
- Sex determination refers to the biological system that determines the development of sexual characteristics in an organism. It is primarily influenced by the chromosomes an organism inherits.

2. **Analyzing the Options**:
- **Option 1**: "The male autosome of grasshopper is XO and the female autosome is XX."
- This statement is correct. In grasshoppers, the male has one X chromosome and no second sex chromosome (XO), while females have two X chromosomes (XX).

- **Option 2**: "Drosophila has XY and XX system."
- This statement is also correct. In Drosophila (fruit flies), males are XY and females are XX, similar to humans.

- **Option 3**: "Birds have females with ZW and males with ZZ."
- This statement is correct. In birds, females are ZW and males are ZZ, which is a known system of sex determination in avian species.

- **Option 4**: "Insects have exotype all sperms, i.e., males have exotype and one set of autosome plus X."
- This statement is incorrect. Insects typically have a sex determination system where males are heteromorphic (XY) and females are homomorphic (XX). The statement incorrectly describes the male sex determination system in insects.

3. **Conclusion**:
- After analyzing all the options, we conclude that **Option 4** is the incorrect statement regarding sex determination in animals.

### Final Answer:
The incorrect statement regarding sex determination in animals is **Option 4**.

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