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Cell Division -Asexual and Sexual Mitosis and Meiosis A Review Cell Cycle = I PMAT C Mitosis is..... -asexual division of life into two identical “daughter cells” -each new cell gets a double set of chromosomes. In humans this is 46. -A double set of chromosomes is referred to as diploid (2n) (ie.2x's number of copies) -mitosis creates new cells in your body and in diploid organisms (all animals and some plants and stages of plants) http://www.exploratorium.edu/imaging_station/students /sea_urchins_div.html Mitosis = PMAT – one division of the nucleus creating an exact copy (clone) Mitosis in Animals I PMAT C – memory trick • I = interphase – performing normal functions (ie growth and preparation and DNA replication) Mitosis: − − − − P = prophase – doubled chromosomes become visible M = metaphase – chromosomes line up at equator of cell A = anaphase – chromosomes separate and move to opposite poles of cell T = telophase – nuclear envelope reforms and 2 new cells begin to form • C = cytokinesis – cell cytoplasm divides in two Identify the stages of mitosis Identify the stages of mitosis - ANSWERS Meiosis = two divisions of the nucleus (meiosis I and meiosis II) - leads to genetic variation This results in half the number of chromosomes (n) which is necessary for sexual reproduction. These cells are haploid (n). Identify the stages of meiosis Identify the stage of meiosis - ANSWERS Anaphase I Metaphase I Prophase II Anaphase II Metaphase II Telophase II Prophase I Telophase I