Unit 2: Introduction to Meiosis Part: The process of Meiosis ch. 8 Flashcards
MCB 181R University of Arizona
Meiosis I: Two sets of chromosomes replicated:
- Two each type of chromosomes.
- Two copies of chromosomes DNA per chromosome.
Meiosis II: One set of non - replicated chromosome:
- One of each type of chromosome.
- One copy of chromosomes DNA per chromosome.
What is the difference between Meiosis I vs. Meiosis II
- Meiosis I: Separates homologous chromosomes, reducing the chromosome number by half.
- Meiosis II: Separates sister chromatids, similar to mitosis, resulting in four haploid daughter cells.
What are the two main divisions of Meiosis?
Meiosis I and Meiosis II
What happens during Prophase I of Meiosis?
Chromosomes condense, homologous chromosomes pair up, and crossing over occurs.
What happens during Prometaphase I of Meiosis?
Spindle fibers attach to the kinetochores of chromosomes.
What happens during Metaphase I of Meiosis?
- Homologous chromosome pairs line up along the metaphase plate.
- Independent assortment occur.
What happens during Anaphase I of Meiosis?
- Homologous chromosomes separate and move to opposite poles.
- Sister chromatids remain attached.
What happens during Telophase I of Meiosis?
- Chromosomes arrive at poles.
- Nuclear poles reform.
- Cytokinesis occurs, forming two haploid cells.
What happens during Prophase II of Meiosis?
- Chromosomes condense again (if they decondensed in Telophase I)
What happens during Prometaphase II of Meiosis?
Spindle fibers attach to the kinetochores of chromosomes.
What happens during Metaphase II of Meiosis?
Sister chromatids line up along the metaphase plate.
What happens during Anaphase II of Meiosis?
Sister chromatids separate and move to opposite poles.
What happens during Telophase II of Meiosis?
- Chromosomes arrive at poles
- Nuclear envelope reforms.
- Cytokinesis occurs, forming four haploid daughter cells.
