| A | B |
|---|
| Binary fission | division of a prokaryotic cell into 2 offspring |
| Events of fission | 1. chromosomes makes a copy 2. cell reaches original size 3. cell wall forms |
| Mitosis | division of cell nucleus |
| Somatic Cells | body cells-# of cells increase without changing information in DNa |
| Unicellular Organisms | all offspring are genetically identical |
| Size of a cell | one factor triggers cell division |
| Cell cycle | sequence of events in a cell from mitosis to mitosis |
| Cell division | one phase of the cycle |
| Mitosis | M phase- division of cell nucleus |
| Cytokenesis | divisions fo cytoplasm |
| Interphase | time between cell division |
| G1 phase | cell doubles in size |
| S phase | DNA replicates |
| G2 phase | cell undergoes rapid growth and prepares for division |
| Cells spend most of their life in what phase? | interphase |
| G0 phase | cells dont copy their DNa and dont prepare for cell division |
| Prophase | first phase- subdivided into three steps |
| early prophase | chromatin coils and forms chromosomes-nuleolus and nuclear membrane dissappear |
| middle prophase | development of spindloe fibers |
| polar fibers | extend across cell- centrosome to centrosome |
| kinetochore fiber | extend from kinetochore( protein found in centrosomes) of each chromatid to one centrosome |
| late prophase | formation of aster- protein fibers that radiate from each centriole |
| metaphase | fibers move chromosomes to the center of the cell |
| Anaphase | centromere of each pair of chromatids divides- chromatids separate- move toward opposite poles |
| Telophase | 2 identical sets of chromatids- opposite sides of the cell- spindle fibers dissappear |
| Cytokenesis | telophase- cytoplasm splits and forms 2 new cells |
| Cleavage furrow | area of membrane that pinches in separating cell into 2 |
