Meiosis1 - Meiosis Meiotic Division I In this section, we...

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Meiosis Meiotic Division I In this section, we will discuss the events of the first meiotic division. As we have already described, meiosis comprises two cellular divisions, meiosis I and meiosis II. We have already introduced the main event occurring in prophase I, genetic reassortment. Here we will discuss all of meiosis I, beginning with prophase I. During prophase 1, when genetic reassortment takes place, the sister chromatids behave as a singular unit. The chromosome pair is identical except for the small region where crossover occurred. Because the very important genetic reassortment event occurs during this phase, prophase 1 can last a very long time: up to 90% of the total duration of meiosis. Other than the genetic crossover event that takes place during prophase 1, the following phases of meiosis I proceed similarly to those of mitosis. After prophase 1, cells enter prometaphase 1. During this phase, the nuclear membrane breaks down, allowing microtubules access to the chromosomes. In this phase, the chromosomes are
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Meiosis1 - Meiosis Meiotic Division I In this section, we...

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