Mendel - Mendel's Experiment heredity theories before...

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Mendel's Experiment heredity theories before Mendel - classical assumption 1 (constancy of species) - heredity occurs within species o possible to get weird combinations by cross-breeding different species o soon obvious that extreme cross-breeding not possible o species maintained w/o much change since creation classical assumption 2 (direct transmission of traits) o gonos - “seed;” reproductive material transmitted from parents to offspring o information about each body part of offspring came from same body part in parent Charles Darwin - believed that “gemmules” (microscopic granules) passed down to offspring to guide development traits from parents blend and mix in the offspring hybridizations - carried out by Josef Koelreuter on tobacco plants o hybrids had different appearances than parents o offspring of hybrids either resembled hybrids or grandparents o proved the classical assumptions wrong o traits/characters segregated among a certain population T. A. Knight - did breeding experiments w/ white/purple plants
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