Cell division, also called mitosis, occurs in multicellular organisms to create tissues, organs and organ systems. It is a method of asexual reproduction in unicellular organisms, and it occurs because it’s essential for... More »

Crossing over begins very early in the prophase I stage of meiosis. During prophase I, pairs of homologous chromosomes exchange lengths of their genetic material. Crossing over leads to recombinant chromosomes and is a k... More »

During interphase, the cell is preparing to divide and is actively synthesizing the required components. Originally and inaccurately referred to as "the resting stage," the interphase is actually a period in which a cons... More »

Cell cycle checkpoints are times during the cell cycle in which the cell checks to see whether it is ready to proceed with mitosis or cell division. Checkpoints occur at three different times during the cell cycle: G1, G... More »

Cell division has three purposes for an organism: reproduction, growth and maintenance. For single-celled organisms, this is their direct and only method of reproduction, and it serves no other purpose. For multicellular... More »

Cell division is limited by a process called cellular senescence, during which cells in culture divide more slowly before stopping entirely. The cells do not necessarily die during senescence, but they no longer replicat... More »

Cell division is part of the cell cycle, and it is caused either by binary fission or as part of a multiple-phase cycle. Binary fission is the method by which prokaryotic cells divide. Eukaryotic cells use the three-phas... More »