MITOSIS HOW BODY CELLS DIVIDE INTERPHASE CELL IS

MITOSIS HOW BODY CELLS DIVIDE

INTERPHASE • CELL IS GROWING • CHROMOSOMES ARE REPLICATED (COPIED) CHROMOSOMES BECOME VISIBLE •

PROPHASE 1. 2. 3. 4. 5. CHROMATIN BECOMES CONDENSED (THICKER) NUCLEOLUS DISAPPEARS NUCLEAR MEMBRANE DISAPPEARS CENTRIOLES BEGIN TO MOVE TOWARDS THE POLES SPINDLE FIBERS START TO APPEAR

METAPHASE • CHROMOSOMES LINE UP ALONG THE MIDDLE OF CELL

ANAPHASE • • CENTROMERES SPLIT ALLOWING CHROMATIDS TO SEPARATE ONE MATCHING CHROMATID MOVES TO EACH POLE

TELOPHASE AND CYTOKINESIS • • CHROMATIDS AT OPPOSITE POLES SPINDLE FIBERS DISAPPEAR NUCLEAR MEMBRANE REAPPEARS CYTOKINESIS: CELL DIVIDES INTO TWO GENETICALLY IDENTICAL CELLS

PNEUMONIC DEVICE I • P • M • A • T •

KEYS TO MITOSIS • Original cell has complete set of chromosomes • This is known as DIPLOID or 2 N • One division results in 2 DAUGHTER CELLS • • • No genetic material exchanged Cells are GENETICALLY IDENTICAL Daughter Cells are also DIPLOID or 2 N • Ex. Original cell has 46 chromosomes, daughter cells will have 46 chromosomes • IN SINGLE CELLED ORGANISMS: • Method of reproduction (ASEXUAL) • Protists, some Algae, and Molds • IN MULTI-CELLED ORGANISMS: • Mitosis used for GROWTH and REPLACEMENT of BODY CELLS (skin, liver, heart etc…)

Basic diagram of mitosis HUMAN SKIN CELL 46 Chromosomes 2 NEW HUMAN SKIN CELLS 46 Chromosomes

SOMETHING ELSE TO HELP: • • YOU AND YOUR GROUP WILL NOW COME UP WITH A SONG ABOUT MITOSIS. BE CREATIVE! THINK OF A TUNE EVERYONE KNOWS LIKE “MARY HAD A LITTLE LAMB” ETC. IF YOU DON’T LIKE MUSIC, WRITE A RAP!