What happens during Prophase I of meiosis?
Understand the Problem
The question is about understanding the process of meiosis, specifically focusing on the events that occur during Prophase I. This includes the pairing of homologous chromosomes and the concept of crossing-over.
Answer
The nuclear envelope fragments, chromatin condenses to chromosomes, homologous chromosomes pair to form tetrads, crossing-over occurs, spindle fibers form.
During Prophase I of meiosis, the nuclear envelope fragments, the chromatin condenses into chromosomes, homologous chromosomes pair to form tetrads, crossing-over occurs, and spindle fibers begin to form.
Answer for screen readers
During Prophase I of meiosis, the nuclear envelope fragments, the chromatin condenses into chromosomes, homologous chromosomes pair to form tetrads, crossing-over occurs, and spindle fibers begin to form.
More Information
Prophase I is essential for ensuring genetic diversity through the process of crossing-over, where segments of DNA are exchanged between homologous chromosomes creating new combinations of alleles.
Tips
A common mistake is to confuse Prophase I of meiosis with Prophase of mitosis. Mitosis does not involve pairing of homologous chromosomes or crossing-over.
Sources
- The Process of Meiosis - Meiosis I, Biology LibreTexts - bio.libretexts.org
- Phases of Meiosis - Khan Academy - khanacademy.org
- NCBI Bookshelf - Prophase I of Meiosis - ncbi.nlm.nih.gov
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