In the XX-XO type of sex chromosomes in
(a) Females produce only one type of eggs
(b) Females have only one X-chromosomes
(c) Males have two X- chromosomes
(d) Males are homogametic

Options

A. Females produce only one type of eggs
B. Females have only one X-chromosomes
C. Males have two X- chromosomes
D. Males are homogametic

Answer

To solve the question regarding the XX-XO type of sex chromosomes, let's analyze each option step by step:

### Step 1: Understand the XX-XO sex determination system
In the XX-XO sex determination system, which is commonly found in organisms like grasshoppers, the sex of the individual is determined by the presence of X chromosomes.

### Step 2: Analyze the options
Now, let's evaluate each option provided in the question:

#### (a) Females produce only one type of eggs
- In this system, females have two X chromosomes (XX). Since both X chromosomes are the same, they can only produce one type of egg, which carries the X chromosome.
- **Conclusion**: This statement is **true**.

#### (b) Females have only one X chromosome
- This statement is incorrect because females in the XX-XO system have two X chromosomes (XX), not one.
- **Conclusion**: This statement is **false**.

#### (c) Males have two X chromosomes
- Males in the XX-XO system have only one X chromosome (XO), where O represents the absence of a second sex chromosome.
- **Conclusion**: This statement is **false**.

#### (d) Males are homogametic
- Homogametic means having two of the same type of sex chromosomes. In this case, males are heterogametic because they have one X chromosome and one O chromosome (XO).
- **Conclusion**: This statement is **false**.

### Step 3: Identify the correct option
Based on the analysis:
- Option (a) is the only true statement. Therefore, the correct answer is **(a) Females produce only one type of eggs**.

### Final Answer
The correct option is **(a) Females produce only one type of eggs**.

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