When does crossing over occur? $$ \begin{array}{l} ext { Wetaphas } \ ext { e I of } \ ext { meiosis I }\end{array} $$ s phase $$ \begin{array}{c} ext { prophase I } \ ext { of meiosis } \ ext { I }\end{array} $$

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When does crossing over occur? $$ \begin{array}{l}	ext { Wetaphas } \ 	ext { e I of } \ 	ext { meiosis I }\end{array} $$ s phase $$ \begin{array}{c}	ext { prophase I } \ 	ext { of meiosis } \ 	ext { I }\end{array} $$

UpStudy AI · Accepted Answer

Crossing over occurs during **prophase I of meiosis I**.

Here's a brief explanation of the process:

1. **Meiosis Overview**: Meiosis is a type of cell division that reduces the chromosome number by half, resulting in four haploid cells. It consists of two consecutive divisions: meiosis I and meiosis II.

2. **Prophase I**: This is the first stage of meiosis I, and it is where crossing over takes place. During prophase I, homologous chromosomes pair up in a process called synapsis, forming structures known as tetrads.

3. **Crossing Over**: While in tetrads, segments of chromatids can exchange genetic material. This exchange of genetic information between homologous chromosomes is what we refer to as crossing over. It increases genetic diversity in the resulting gametes.

In summary, crossing over occurs specifically during **prophase I of meiosis I**.
Crossing over happens during prophase I of meiosis I.

When does crossing over occur?

s phase

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When does crossing over occur? s phase