What are the key events that occur during Meiosis I?

• A. Sister chromatids separate and move to opposite poles.
• B. Chromosomes line up individually along the metaphase plate.
• C. Homologous chromosomes pair and exchange segments.
• D. The nuclear envelope reforms around each set of chromosomes.

Answer: (C)

Verified step by step guidance

1. Understand that Meiosis I is the first division in meiosis, which reduces the chromosome number by half and is crucial for sexual reproduction.
2. Recognize that during Prophase I, homologous chromosomes pair up in a process called synapsis, forming structures known as tetrads.
3. During Prophase I, crossing over occurs where homologous chromosomes exchange genetic material, increasing genetic diversity.
4. In Metaphase I, homologous chromosome pairs (tetrads) align along the metaphase plate, not individual chromosomes as in mitosis.
5. During Anaphase I, homologous chromosomes are separated and pulled to opposite poles, unlike mitosis where sister chromatids are separated.