Sex determination in most of the insects is:

Options

A. XO type , female heterogamety
B. XO type, male heterogamety
C. ZW type, female heterogamety
D. ZW type, male heterogamety

Answer

To solve the question regarding sex determination in most insects, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Sex Determination**:
- Sex determination refers to the biological mechanism that determines the development of sexual characteristics in an organism.

2. **Types of Sex Determination**:
- There are various types of sex determination systems, including chromosomal systems, environmental systems, and others. In insects, the chromosomal system is most relevant.

3. **Male Heterogamity**:
- In many insects, males are heterogametic, meaning they have two different sex chromosomes (e.g., XY), while females are homogametic (XX). This is referred to as male heterogamity.

4. **Exotype vs. JW Type**:
- The terms "exotype" and "JW type" refer to different classifications of sex determination systems. In the context of insects, "exotype" is commonly associated with the male heterogamity system.

5. **Conclusion**:
- Given that most insects exhibit male heterogamity as their mode of sex determination, the correct answer to the question is **Option B: Exotype Male Heterogamity**.

### Final Answer:
**The sex determination in most of the insects is Exotype Male Heterogamity (Option B).**

---