XO tyep of sex determination and XY type of sex determination are the examples of

Options

A. male heterogamety
B. female heterogamety
C. male homogamety
D. both (b) and (c)

Answer

To solve the question regarding XO and XY types of sex determination, we will analyze the definitions and characteristics of each type of sex determination and the gametes produced by males and females.

### Step-by-Step Solution:

1. **Understanding Sex Determination**:
- Sex determination is the biological mechanism that determines the sex of an organism. It can be influenced by various genetic systems.

2. **Identifying XO Type**:
- In the XO type of sex determination, commonly found in organisms like grasshoppers, males have one X chromosome and one O (absence of a second sex chromosome), denoted as XO.
- Females have two X chromosomes, denoted as XX.
- Males produce two types of gametes: X and O (heterogametic).
- Females produce only one type of gamete: X (homogametic).

3. **Identifying XY Type**:
- In the XY type of sex determination, which is typical in humans, males have one X and one Y chromosome, denoted as XY.
- Females have two X chromosomes, denoted as XX.
- Males produce two types of gametes: X and Y (heterogametic).
- Females again produce only one type of gamete: X (homogametic).

4. **Comparing the Two Types**:
- In both the XO and XY systems, males are heterogametic because they produce two different types of gametes (X and O in XO; X and Y in XY).
- Females are homogametic as they produce only one type of gamete (X in both cases).

5. **Conclusion**:
- Since both XO and XY types of sex determination show that males produce two types of gametes (heterogametic), the correct answer to the question is that both are examples of **male heterogamety**.

### Final Answer:
The correct answer is **male heterogamety**.