|9780822947936|Challenging Twentieth-Century Genetics|The global triumph of Mendelian genetics in the twentieth century was not a foregone conclusion, thanks to the existence of graft hybrids. These chimeral plants and animals are created by grafting tissue from one organism to another with the goal of passing the newly hybridized genetic material on to their offspring. But prevailing genetic theory insisted that heredity was confined to the sex cells and there was no inheritance of characteristics acquired during an organism’s lifetime. Under sustained attacks from geneticists, scientific belief in the existence of graft hybrids slowly began to decline. Yet ordinary horticulturalists and breeders...