| A | B |
|---|
| sexual reproduction | two cells join to make a new organism |
| asexual reproduction | a single cell makes an exact copy of itself |
| Gap 1 | first step of the cell cycle |
| Gap 1 | the cell grows and makes new organelles |
| S phase | second step of the cell cycle |
| S phase | all DNA in the cell is copied |
| Gap 2 | third step of the cell cycle |
| Gap 2 | the cell quickly gets ready to divide |
| M phase | the fourth step of the cell cycle |
| M phase | first the nucleus and then the cell divide |
| mitosis | division of the nucleus |
| cytokinesis | division of the cytoplasm |
| centrioles | cell parts at opposite ends of the cell to separate sister chromatids |
| spindle fiber | chain of protein that separates sister chromatids |
| centromere | midpoint where sister chromatids attach |
| sister chromatids | identical copies of the same chromosome |
| chromosome | a long piece of DNA |
| prophase | first step of mitosis |
| prophase | the nuclear membrane breaks down |
| prophase (a) | spindle fibers form |
| prophase | chromosome become visible |
| metaphase | second step of mitosis |
| metaphase | chromosomes line up in the middle of the cell |
| metaphase | spindle fiber attaches to centromeres |
| anaphase | third step of mitosis |
| anaphase | sister chromatids are pulled apart |
| telophase | fourth step of mitosis |
| telophase | two new nuclear membranes form |
| telophase | spindle fiber breaks down |
| telophase | chromosomes spread out |
| prophase |  |
| prophase |  |
| metaphase |  |
| metaphase |  |
| anaphase |  |
| anaphase |  |
| telophase |  |
| telophase |  |
