In Moths, the sex-determination mechanism is of ..................... type.

Options

A. XX-XX Type
B. ZZ-ZO Type
C. XX-XY Type
D. ZZ-ZW Type

Explanation

To determine the sex-determination mechanism in moths, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Gametes**: In moths, the female produces two types of gametes. This means that the female is heterogametic. One type of gamete carries the Z chromosome, and the other type does not carry the Z chromosome (denoted as O).

2. **Identifying Male Gametes**: The male moths, on the other hand, are homogametic, meaning they produce only one type of gamete. All male gametes carry the Z chromosome.

3. **Analyzing Offspring**: When a female moth produces eggs, 50% of the eggs will have the Z chromosome, and 50% will have the O chromosome. If a male moth (which only has Z gametes) fertilizes these eggs, the combinations will be:
- Z (from female) + Z (from male) = Male offspring (ZZ)
- O (from female) + Z (from male) = Female offspring (ZO)

4. **Conclusion on Sex Determination Mechanism**: Based on the above analysis, the sex-determination mechanism in moths is of the ZW/ZZ type, where:
- Females are ZO (heterogametic)
- Males are ZZ (homogametic)

### Final Answer:
The sex-determination mechanism in moths is of **ZZ-ZO type**.

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