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Simple organisms may be unicellular, consisting of just one cell, while more complex organisms are multicellular. There are two types of cell division. Mitosis is used for growth and repair and produces diploid cells identical to each other and the parent cell. Meiosis is used for sexual reproduction and produces haploid cells different to each other and the parent cell. Unicellular vs multicellular An ameoba, a simple unicellular organism
Single-celled eukaryotes, such as amoeba and yeast, use mitosis to reproduce asexually and increase their population numbers. Multicellular eukaryotes use mitosis to grow or heal injured tissues. The second type of cell division, meiosis, is a specialized form of cell division that occurs in organisms that reproduce sexually (that is, by combining the unique genetic information of two parents). Meiosis produces reproductive cells, such as sperm cells, egg cells and spores from plants and fungi.