history - History of Genetics People have known about...

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History of Genetics People have known about inheritance for a long time. --children resemble their parents --domestication of animals and plants, selective breeding for good characteristics --Sumerian horse breeding records --Egyptian data palm breeding --Bible and hemophilia
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Old Ideas Despite knowing about inheritance in general, a number of incorrect ideas had to be generated and overcome before modern genetics could arise. 1. All life comes from other life. Living organisms are not spontaneously generated from non-living material. Big exception: origin of life. 2. Species concept: offspring arise only when two members of the same species mate. Monstrous hybrids don’t exist.
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More Old Ideas 3. Organisms develop by expressing information carried in their hereditary material. As opposed to “preformation”, the idea that in each sperm (or egg) is a tiny, fully-formed human that merely grows in size. 4. The environment can’t alter the hereditary material in a directed fashion. There is no “inheritance of acquired characteristics”. Mutations are random events.
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More Old Ideas 5. Male and female parents contribute equally to the offspring. --ancient Greek idea: male plants a “seed” in the female “garden”. --alleged New Guinea belief: sex is not related to reproduction.
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Mid 1800’s Discoveries Three major events in the mid-1800’s led directly to the development of modern genetics. 1859: Charles Darwin publishes The Origin of Species , which describes the theory of evolution by natural selection. This theory requires heredity to work. 1866: Gregor Mendel publishes Experiments in
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history - History of Genetics People have known about...

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