mitosis, meiosis

mitosis: The process in cell division by which the nucleus divides, typically consisting of four stages, prophase, metaphase, anaphase, and telophase, and normally resulting in two new nuclei, each of which contains a complete copy of the parental chromosomes

meiosis: The process of cell division in sexually reproducing organisms that reduces the number of chromosomes in reproductive cells, leading to the production of gametes in animals and spores in plants.