Grasshopper is an example of XO type of sex determination in which the males have_______

Options

A. one X chromosome
B. One Y chromosome
C. two Y chromosomes
D. no X-chromosome

Answer

To solve the question regarding the sex determination in grasshoppers, we will follow these steps:

### Step 1: Understand the sex determination system in grasshoppers.
Grasshoppers exhibit an XO type of sex determination system. In this system, males have one X chromosome and no second sex chromosome, while females have two X chromosomes.

**Hint:** Remember that in XO systems, males are typically heterogametic with one X chromosome, while females are homogametic with two X chromosomes.

### Step 2: Identify the chromosome composition in males.
In grasshoppers, males are represented as XO, meaning they have one X chromosome and no Y chromosome. This is different from many other organisms where males typically have both X and Y chromosomes.

**Hint:** Focus on the fact that in the XO system, the absence of a second sex chromosome (Y) is crucial for identifying male grasshoppers.

### Step 3: Analyze the options given in the question.
The options provided were:
1. One X chromosome
2. One Y chromosome
3. Two Y chromosomes
4. No X chromosomes

From our understanding of the XO system, the correct choice is that males have one X chromosome.

**Hint:** Eliminate options that do not conform to the XO sex determination system, particularly those that suggest the presence of Y chromosomes.

### Step 4: Conclude the answer.
Based on the analysis, the correct answer is that males in grasshoppers have **one X chromosome**.

**Final Answer:** One X chromosome.