Word: germ
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...seems likely that, before becoming extinct, Neanderthal Man interbred with the more highly evolved men who supplanted and sometimes ate him. Dr. Hrdlicka thinks that many living people have Neanderthal blood in their veins (or more precisely, Neanderthal genes in their germ plasm), points to suspiciously Neanderthaloid features which crop out in 20th Century humans...
...just produced a record-breaking beam of 19,000,000-volt particles. By stuffing the bacillus with radioactive phosphorus produced in cyclotron bombardments, the California researchers will ry to make it give off a continuing stream of telltale emanations. Then, after injection into laboratory animals, the emanating germ's first furtive fortnight may be observed...
...pitted in debate against a booming bigwig, Professor Edward Drinker Cope of University of Pennsylvania, who advanced the Lamarckian view that acquired characteristics (e.g., muscular development or manual skill) can be inherited. Conklin defended the opposite view, boldly stated that inherited characteristics are determined solely by the germ plasm. In the course of time biology gave him the palm over Bigwig Cope. Today almost all top-notch biologists have swept Lamarckism under the rug. A Conklin crack...
...whole burden of evolution. Many scientists grew so contemptuous of natural selection that they called it pure fiction. Darwin knew nothing of the Mendelian heredity laws, nothing about the mechanism of mutations (sudden, conspicuous changes in plants and animals which subsequently breed true because of changes in the germ plasm). With the discovery of mutations some biologists decided that nothing else was necessary for evolution...
...fruit fly's germ cells are eight narrow little blobs called chromosomes. On these Morgan tracked down the positions of hundreds of invisible genes (heredity transmitters) each of which seemed to control a single body characteristic-such as eye color, chest bristles, wing shape-in the offspring. When a segment of a chromosome broke off during reproduction, all the features controlled by the genes on that segment were affected...