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Transcript
Ch11.1p265-273 Cell Growth and Reproduction When do cells divide? All the time. Cells multiply to grow bodies larger. Cell Reproduction19th Century microscopes = The Role of Chromosomes understanding of Cells -The discovery of Chromosomes DNA is always in a cell. Chromosomes are coiled DNA -The structure of eukaryotic chromosomes Chromatine is uncoiled DNA Uncoiled DNA performs function in cell The Cell Cycle The sequence of growth and division of a cell. Cells grow and reproduce. Interphase= cell growth, metabolism, And DNA replication. Mitosis= nuclear + cytoplasm division Interphase- a busy time Performing the regular functions of the cell 3 parts to interphase 1st= grows + make proteins 2nd= copies chromosomes 3rd= growth, prep for division The Phases of Mitosis cell cycle is a continuous process, 4 phases, prophase, metaphase, anaphase, telophase Prophase- The first phase of mitosis DNA coils up to chromosomes Copies of dna = sister chromatids Nuclear envelope disappears Centrioles migrate to opposite ends of cell ChromotidsLined up between centrioles. Microtubulals make up the spindle Metaphase- The 2nd stage of mitosis Chromosomes become attached to spindle fibers and line up in middle of cell. rd Anaphase- The 3 phase of mitosis Sister chromatides start to separate moving toward opposite sides of cell Telophase- The 4th stage of mitosis Chromatides reach opposite sides of cell. Chromatides unwinds to become chromatine dna again. Nuclear envelope forms again. Division of the cytoplasm Plasma membrane pinches in the middle of the cell forming two cells from one = 2 daughter cells Plants = no pinching in rather formation of new wall. Results of mitosis makes 2 identical cells that perform identical functions of original cell Grow until they split again.