BIOL 1090 Lecture Notes - Lecture 1: Sister Chromatids, G1 Phase, Chromosome
11 Jan 2017
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Document Summary
Every cell duplicates itself in 20 min (zebra fish embryo) Start with one cell and end up with two identical daughter cells. Common view of dna is the chromosome during metaphase. Each mitotic chromosome is comprised of a pair of identical sister chromatids. Homologs inherited from mother and father. When cells go through cell division everything in the cell is broken down and divided equally to the daughter cells. Endoplasmic reticulum and golgi complex are fragmented at the time of division and reformed in the daughter cells. Mitochondria and chloroplasts are randomly divided between daughter cells. Nuclear chromosomes must be duplicated exactly and distributed equally and exactly to daughter cells. Cell cycle time can be 30 minutes to several years (hair) M phase chromosomal separation ad cytokinesis. Embryonic cells skip the g1 phase growth and metabolism. Cells that are not actively cycling may exit the cell cycle - from g1 they enter.
