Distinguish between equational division and reduction division

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This is a biology question; you are referring to the two main types of cell division. Living organisms can be either unicellular or multicellular. When unicellular organisms reproduce, they use the process of mitosis, which is an equational division. This means that before the cell divides, it duplicates its DNA...

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This is a biology question; you are referring to the two main types of cell division. Living organisms can be either unicellular or multicellular. When unicellular organisms reproduce, they use the process of mitosis, which is an equational division. This means that before the cell divides, it duplicates its DNA so that when it divides into two cells each has the same amount of genetic material as the original cell. Mitosis is also how new cells are generated for growth or repair in multicellular organisms. All cells from multicellular organisms that undergo mitosis also generate cells that have the same amount of DNA as the original cell.

For a multicellular organism to reproduce, however, specialized reproductive cells undergo a reduction division called meiosis. In order to sexually reproduce--that is, to combine genetic material from two different organisms--the organisms must produce reproductive cells that have only half the amount of DNA so that when the two reproductive cells unite, the original number of chromosomes/amount of DNA is restored in the offspring. In meiosis, the cells undergo two sets of division but only duplicate their DNA once. This results in reproductive cells (egg and sperm, for example) that have half the amount of DNA.

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