A divide is the highest ridge of terrain separating river basins. Divides can be relatively small and cover just a few dozen miles, or they can stretch thousands of miles. On either side of a divide, water drains into separate basins. Continue Reading.
Concept 2: Mitosis and the Cell Division Cycle. Cells that are growing and dividing go through a repeating series of events called the cell division cycle (or cell cycle). During the first phase (G1), the cell grows and prepares for DNA replication, which occurs in the subsequent S phase. Further growth takes place in the G2 phase, and finally mitosis occurs in the M phase. G1, S, and G2 are collectively called interphase.
What occurs in meiosis but not mitosis? Mitosis and meiosis are specialized types of cell division, but take place in different locations. Mitosis occurs only in body cells, or somatic cells, while meiosis takes place in the cells of the testes and ovaries, which are the primary reproductive organs. Mitosis is triggered by the coupling of haploid sperm with a haploid egg; this coupling leads to fertilization.