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Inherited sources of genetic variation One of the key features of all living things from single celled organisms such as amoeba, to plants and animals such as humans, is the ability to reproduce. In smaller single celled organisms such as the amoeba this reproduction is asexual and takes place by a process known as mitosis. Mitosis produces two daughter cells that are genetically identical to, or clones of their parent cell. This process however produces no genetic variation within a community; meaning that the process of evolution is limited and can only take place through an advantageous mutation over a long period of time. Mitosis also produces somatic, or body cells for growth and repair in multi-cellular organisms. To increase genetic variation other larger and more complex organisms such as plants and animals reproduce sexually by Meiosis. Meiosis causes the formation of four daughter cells, however in female ova only one...

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