Male heterogametic ,XX-XO type of sex determination is found in

Options

A. Butterflies
B. Moth
C. Grasshoppers
D. Drosophila

Answer

To solve the question about which organisms exhibit male heterogametic XX-XO type of sex determination, we can follow these steps:

### Step 1: Understand Male Heterogametic and XX-XO Sex Determination
- Male heterogametic means that males produce two different types of gametes. In this case, they produce gametes with one X chromosome and gametes without any sex chromosome (O).
- In XX-XO sex determination, females have two X chromosomes (XX), while males have only one X chromosome (XO).

### Step 2: Identify Examples of XX-XO Sex Determination
- This type of sex determination is commonly found in certain insects and organisms. Notably, grasshoppers and some roundworms exhibit this type of sex determination.
- In grasshoppers, males have one X chromosome (XO), while females have two X chromosomes (XX).

### Step 3: Analyze the Options Given
- If the options provided include organisms like butterflies, moths, Drosophila, and grasshoppers:
- Butterflies and moths typically exhibit ZW-ZZ sex determination (ZW for females, ZZ for males).
- Drosophila (fruit flies) exhibit an XY sex determination system similar to humans (XX-XY).
- Grasshoppers are known for the XX-XO system.

### Step 4: Conclude the Correct Answer
- Based on the analysis, the correct answer to the question is grasshoppers, as they are the organisms that exhibit male heterogametic XX-XO type of sex determination.

### Final Answer:
The male heterogametic XX-XO type of sex determination is found in **grasshoppers**.

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