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Meiosis I: Anaphase I and Telophase I

by Georgina Cornwall, PhD
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    00:00 So, now that we move on to anaphase. All the same things are happening. Many of the same cell cycle controls are in place. Have this spindle fibers pull chromosomes towards the opposite end of the cell.

    00:15 Keep in mind the language here is chromosomes. We're pulling apart homologous chromosomes.

    00:22 We're pulling apart homologous pairs. I like to always consider the word replicated so I can keep it straight in my head. We are not only pulling apart homologous chromosomes because that's not what's happening. They are replicated homologous chromosomes. And in anaphase, those are separated Right? And then we move on into looking at further extension. So sister chromatids are still stuck together moving into the cell. We've got one of each homolog moving into each new nucleus.

    00:57 And then we see that there is nuclear envelope reformation possibly, depending on the species.

    01:06 We reform the envelope. However, we do not necessarily have cytokinesis occur between meiosis I and meiosis II. So, moving forward from here we will go into meiosis II directly. Again, there is no synthesis. So we've separated homologous chromosomes. We don't go through any cell cycle.

    01:34 We are just going to go boom, straight into meiosis II and separate the sister chromatids.

    01:40 So, DNA replication occurs before meiosis I but does not occur before meiosis II.


    About the Lecture

    The lecture Meiosis I: Anaphase I and Telophase I by Georgina Cornwall, PhD is from the course Cell Cycle and Cell Division.


    Included Quiz Questions

    1. Meiosis-I and meiosis-II phases are always separated by a long lasting interphase in between them
    2. During anaphase-I, the replicated homologous chromosomes move apart towards the opposite poles with the help of kinetochore microtubules
    3. There is no DNA synthesis between the meiosis-I and meiosis-II phases
    4. During telophase-I, the nuclear envelope formation may or may not occur depending upon the organism species
    5. Cytokinesis may or may not occur between meiosis-I and meiosis-II divisions

    Author of lecture Meiosis I: Anaphase I and Telophase I

     Georgina Cornwall, PhD

    Georgina Cornwall, PhD


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