When does crossing over occur?Group of answer choicestelophase IIanaphase Imetaphase Iprophase IIanaphase IIprophase Itelophase Imetaphase II

Breakdown the Problem

1. Identify the Process: Recognize that crossing over is a key event in meiosis.
2. Locate Meiosis Stages: Understand where in meiosis crossing over occurs.

Relevant Concepts

1. Crossing Over Definition: Crossing over refers to the exchange of genetic material between homologous chromosomes.
2. Meiosis Stages: Meiosis consists of two stages: Meiosis I and Meiosis II.

Analysis and Detail

1. Prophase I: Crossing over occurs during prophase I of meiosis, specifically in the zygotene stage when homologous chromosomes pair up and exchange segments.
2. Other Stages:
   • Telophase II: This is the final phase of meiosis II.
   • Anaphase I and Anaphase II: These are stages where chromosomes are separated.
   • Metaphase I and Metaphase II: Chromosomes align at the cell equator but do not undergo crossing over.
   • Prophase II: This is a separate phase where no crossing over occurs.

Verify and Summarize

Crossing over specifically occurs during Prophase I of meiosis.

Final Answer

Crossing over occurs during Prophase I of meiosis.