BIOA01H3 Lecture Notes - Lecture 30: Sister Chromatids, Synapsis, Cell Division
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The process by which cells make more cells. Cell cycle (eukaryotes: g 1 phase, s phase, g 2 phase, g 0 phase. Order: g 1 phase s phase g 2 phase m phase. G 0 phase does not actively go through cell division. Homologous chromosomes are duplicated chromosomes of the previous one. Mitosis stages: prophase, prometaphase, metaphase, anaphase, telophase and cytokinesis. Each daughter cell contains the same number of chromosomes as parent cell. Each daughter cell contains half the number of chromosomes as the parent. Prophase i (meiosis i: chromosomes first become visible as thin threads. Dna replication is already complete: homologous chromosomes continue to condense and undergo synapsis, when synapsis is complete, each pair of homologous chromosomes forms a bivalent (gene-for-gene pairing, each chromosome consists of two sister chromatids. Homologous pairs line up in center of cell, with bivalents oriented randomly with respect. Relatively the same distance from the poles because kinetochore can sense tension and.