Crossing over occurs during **prophase I** of meiosis. This is the stage when homologous chromosomes pair up and exchange segments of genetic material, which contributes to genetic diversity in the resulting gametes.

Here's a brief overview of the options provided:

1. **Prophase I**: This is when crossing over occurs.
2. **Prophase II**: Crossing over does not occur here, as the chromosomes are already in their replicated form.
3. **Metaphase I and II**: These stages involve alignment and separation of chromosomes but not crossing over.
4. **Anaphase I and II, Telophase I and II**: These stages pertain to the separation and cytokinesis of chromosomes, with no crossing over occurring.

### Final Answer
Crossing over occurs during **prophase I**.

Question

Crossing over occurs during **prophase I** of meiosis. This is the stage when homologous chromosomes pair up and exchange segments of genetic material, which contributes to genetic diversity in the resulting gametes.

Here's a brief overview of the options provided:

1. **Prophase I**: This is when crossing over occurs.
2. **Prophase II**: Crossing over does not occur here, as the chromosomes are already in their replicated form.
3. **Metaphase I and II**: These stages involve alignment and separation of chromosomes but not crossing over.
4. **Anaphase I and II, Telophase I and II**: These stages pertain to the separation and cytokinesis of chromosomes, with no crossing over occurring.

### Final Answer
Crossing over occurs during **prophase I**.

Knowee AI · Accepted Answer

Crossing over occurs during **prophase I** of meiosis. This is the stage when homologous chromosomes pair up and exchange segments of genetic material, which contributes to genetic diversity in the resulting gametes.

Here's a brief overview of the options provided:

1. **Prophase I**: This is when crossing over occurs.
2. **Prophase II**: Crossing over does not occur here, as the chromosomes are already in their replicated form.
3. **Metaphase I and II**: These stages involve alignment and separation of chromosomes but not crossing over.
4. **Anaphase I and II, Telophase I and II**: These stages pertain to the separation and cytokinesis of chromosomes, with no crossing over occurring.

### Final Answer
Crossing over occurs during **prophase I**.

When does crossing over occur?Group of answer choicesprophase IIanaphase Itelophase Iprophase Ianaphase IItelophase IImetaphase Imetaphase II

Question

When does crossing over occur?

Solution

Final Answer

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