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NAME:_____________________ CHAPTER 4.3 NOTES – CELL DIVISION What is the cell cycle? The ______________ sequence cells go through What are daughter cells? Result of when cells ______________. Stage 1 – What is interphase? Before Cell Division – NOT PART OF MITOSIS! Cells grow, copy _____________ (mitochondria and Chloroplasts) and prepare to divide Chromatin is thick mass with a clear nucleus What is replication? Cells make an ____________ copy of _________________ Daughter cells have exact copies of DNA What is STAGE 2 – MITOSIS? Cells ________________ divides into two nuclei. What are the 4 phases of Mitosis? PMAT – ___________________, __________________, ____________________, ______________________. (Paul Made Anna Tea) (Pizza Makes Anthony Tired) 1 NAME:_____________________ What is a chromosome? Double rod structure of ____________________ Held together by a ___________________ Each rod = ____________________ What happens during Prophase? _____________________ form Centrioles move to __________________ _________________ fibers form Nuclear envelope _____________________ What happens during Metaphase? Chromosomes line up at the _____________________ Attach to spindle fibers at ____________________ What happens during Anaphase? Centromeres ________________ Chromatids separate = new __________________ Cells stretches out What happens during Telophase? Chromosomes stretch out Nuclear ____________________ forms 2 NAME:_____________________ What is STAGE 3 CYTOKINESIS? Final stage of cell cycle – starts with _________________ ____________________ divides Cell membrane pinches _______________ (animal Cells) Cell plate forms (_______________ cells) Two identical daughter cells created THE CELL CYCLE 3 NAME:_____________________ 4.3 CELL DIVISION NOTES Cell Division Occurs in a series of stages or phases. 1st Interphase Chromatid ______________________ are copied (# doubles) Chromosomes appear as threadlike coils (_______________) at the start, but each chromosome and its copy Centromere (sister chromosome) change to sister __________________ at end of this phase. 2ND PHASE - PROPHASE Mitosis begins (cell begins to ____________) Centrioles (or poles) appear and begin to move to opposite ends of the cell. ____________ fibers form between the poles 3RD PHASE – METAPHSE Chromatids (or pairs of Chromosomes) attach to the _____________ ______________. Line up at the _________________. 4TH PHASE – ANAPHASE _____________________ (or pairs of chromosomes) separate and begin to move to opposite ends of the cell. 4 NAME:_____________________ 5TH PHASE – TELOPHASE Two new _____________________ form Chromosomes appear as ___________________ (threads rather than rods) Mitosis ends 6TH PHASE - CYTOKINESIS Cell Membrane moves ________________ to create two daughter cells – each with its own nucleus with _______________ chromosomes. Starts same time as telophase Cell membrane pinches inward (__________________ Cells) Cell plate forms (_______________cells) Look at the two new daughter cells! 5