BIO 191 Lecture Notes - Lecture 12: Centromere, Microtubule Organizing Center, Spindle Apparatus

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Cells must carry an info storage method. 1855- rudolf virchow omnis cellula e cellula . Process of cell division called the cell cycle. Mitosis: one cell makes two identical daughter cells. Meiosis- cell cycle that makes cells with different gene content. Two copies of everything and produces 1 copy (eggs and sperm) In eukaryotes, dna is bound to proteins to form chromatin, which makes up the chromosomes. In mitosis, the two sister chromatids separate from each other. Humans have 23 pairs of chromosomesso 46 chromosomes. Every cell is from copying this initial genome. 6 words of mitosis: copy em, lock em, move em : Cohesin is a protein ring that holds the sister chromatids together. The cell cycle: g1---> s ---> g2 ---> m ---> g1. During s phase the chromosome replicate, forming two sister chromatids held together by cohesins. M phase: prophase ---> prometaphase ---> metaphase ---> anaphase ---> telophase.

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