Genetics promises to bring about dramatic changes in almost every area of life the cure and prevention of disease the extension of the human life span the modification of food crops to feed the worlds hungry improved intelligence quotients more rigorous law enforcement laboratory grown replacement organs and other body parts even the designing of babies to specifications determined by . Because the basic rules of inheritance mendel discovered apply to humans as well as to peas his work is of prime relevance for paleoanthropology and human evolution nevertheless mendels work was beyond the thinking of the time its significance was overlooked and unrecognized until the beginning of the 20th century mendelian genetics mendels research mendel observed that his peas had . Human evolutionary genetics studies how one human genome differs from another human genome the evolutionary past that gave rise to the human genome and its current effects differences between genomes have anthropological medical historical and forensic implications and applications genetic data can provide important insights into human evolution. Aspects of genetics including mutation hybridisation cloning genetic engineering and eugenics have appeared in fiction since the 19th century genetics is a young science having started in 1900 with the rediscovery of gregor mendels study on the inheritance of traits in pea plants during the 20th century it developed to create new sciences and technologies including molecular biology . At the start of the 20th century the works of mendel were rediscovered by three scientists namely carl correnshugo de vries andand erik tschermak 1902 walter sutton and theodore boveri postulated the chromosomal theory which describes that chromosomes carry the cells genetic material gene 1905 nettie stevens observed the sex chromosomes x and y 3 in the same year thomas morgan
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