Cell Cycle: Meiosis SUMMARY Prof. Paulo Jubilut
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It's time to understand once and for all what MEIOSIS is and how it happens. A division process in which a diploid cell (2n) produces 4 haploid cells (n), reducing the cell's chromosomes by half the initial number. It all happens due to a single chromosome duplication, followed by two nuclear divisions: meiosis I and meiosis II. In animals, the process occurs in the gonads and results in the formation of gametes (reproductive cells). Both meiosis I and meiosis II are divided into 4 phases. Meiosis I is divided into prophase I, metaphase I, anaphase I and telophase I. Meiosis II presents the following divisions: prophase II, metaphase II, anaphase II and telophase II. During meiosis I, a diploid cell divides into two haploid daughter cells. The sister chromatids of homologous chromosomes break and then join in the opposite position: one chromatid joins a fragment of its homologous chromosome and vice versa. The phenomenon that leads to the exchange of pieces between homologous chromosomes is called crossing-over. Meiosis I ends with the formation of new nuclei and cytoplasmic division. In meiosis II, which is very similar to mitosis, the genetic material is duplicated and separated. The sister chromatids are separated by the spindle fibers and pulled to opposite poles of the cell. Finally, with the division of the cytoplasm, meiosis is completed, with a final result of 4 haploid cells. MEET MY NETWORKS - - - - - - - - - - - - - - - - - - - - - - - - - - ⭐ INSTAGRAM: / paulojubilut ⭐ TIKTOK: / paulojubilut ⭐ My PRE-COLLEGE: https://bit.ly/aprova_total WELCOME TO MY CHANNEL - - - - - - - - - - - - - - - - - - - - - - - - - - My name is Paulo Jubilut, I am a biologist and I have been here on YouTube since 2011 bringing the universe of biology to social networks. On this channel, you will find frequent videos about how biology connects with your daily life, and the best part: in a simple way to understand.
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