In XO type of sex determination

Options

A. females produce two different types of gametes
B. males produce two different types of gametes
C. females produce gametes with Y chromosome
D. males produce gametes with Y chromosome

Answer

### Step-by-Step Solution:

1. **Understanding XO Sex Determination**:
- In the XO type of sex determination, which is observed in organisms like grasshoppers and some insects, males have one X chromosome and no second sex chromosome (represented as XO), while females have two X chromosomes (XX).

2. **Identifying Gamete Production**:
- Males (XO) are heterogametic, meaning they produce two types of gametes: one with the X chromosome and one without any sex chromosome (O).
- Females (XX) are homogametic, meaning they produce only one type of gamete, which contains an X chromosome.

3. **Analyzing the Options**:
- **Option 1**: "Females produce two types of gametes." - This is incorrect because females only produce one type of gamete (X).
- **Option 2**: "Males produce two different types of gametes." - This is correct because males produce gametes with X and O.
- **Option 3**: "Females produce gametes with Y chromosome." - This is incorrect because females do not have Y chromosomes; they only have X chromosomes.
- **Option 4**: "Males produce gametes with Y chromosome." - This is also incorrect as males in the XO system do not possess a Y chromosome.

4. **Conclusion**:
- The only correct statement regarding the XO type of sex determination is that males produce two different types of gametes.

### Final Answer:
The correct option is that males produce two different types of gametes.

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