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10.2 Mitosis Notes Eukaryotic Cell Cycle - 5 stages - how somatic (body) cells divide INTERPHASE: the longest phase - most cells are in this phase. The cell is not dividing but is growing and preparing to divide. 1. G 1 - Gap 1 - cell growing rapidly and building more organelles - stays in G 1 if not dividing. •. 2. S - Synthesis phase - DNA is copied, chromosomes are 2 sister chromatids attached by a centromere. 3. G2 - Gap 2 - Continues growing and building structures CELL DIVISION: for division. 1 cell divides into 2 identical daughter cells ~ fC\ ./;-::\ ":.:::.-"(j):' 4. Mitosis - nucleus and DNA divide 5. Cytokinesis - cytoplasm and organelles divide ~ ~ - .•.. .... ...•. .-- ...--'~ G2 (growlhand preparation for mitosis) MITOSIS - 4 Stages 1 Prophase - mitosis begins, centrioles and spindle fibers appear 2. Metaphase - chromosomes line up in middle of cell, attach to spindle fibers 3. Anaphase - spindle fibers shorten, pulling chromatids apart to opposite poles .4. Telophase -:-nuclear envelope forms around set of chromosomes at each end, . -~~, chromosomes uncoil, spindle fibers disappear. '\ ~lop f,o ~ .._/ h~t. . (; ' . . \" ~ . ~'-ClS c. ~ , t t \" ( > \ '- ./ ~"" I CJ JL )