Christiane Nüsslein-Volhard and Eric Wieschaus describe genetic mutations affecting the body plan of the fruit fly Drosophila, and identify genes controlling the basic body plans of all animals. These genes will eventually be known as Hox genes.

Paul Berg, Walter Gilbert, and Frederick Sanger share a Nobel Prize in Chemistry, with Berg cited for his fundamental studies of the biochemistry of nucleic acids, with particular regard to recombinant-DNA, and Gilbert and Sanger cited for their contributions concerning the determination of base sequences in nucleic acids. This is Sanger's second Nobel, the first having come in 1958 for his work on the structure of insulin.

Louis W. Alvarez, Walter Alvarez, Frank Asaro and Helen V. Michel publish their asteroid impact theory of dinosaur extinction. The theory will not gain widespread acceptance among scientists for several years.

(no entry for this year)

(no entry for this year)

Barbara McClintock receives the Nobel Prize in Medicine for her discovery of mobile genetic elements.

German paleobiologist Adolf Seilacher suggests that most of the Ediacaran fossils discovered in the 1940s are not related to any modern forms. Calling them vendobionts, he argues that they went extinct after the emergence of large predators. Seilacher's interpretation, however, will remain in dispute.

David Raup and Jack Sepkoski publish the controversial claim that mass extinctions are regularly spaced at 26 million years.

Richard Leakey and his team discover Turkana Boy, the most complete Homo erectus fossil yet discovered.

Kenneth Oakley publishes Decorative and Symbolic Uses of Fossils describing, among other things, a hand axe crafted by Homo heidelbergensis featuring a fossil sea urchin, and a fossil urchin set within a bronze locket from a Gallo-Roman temple.

Paleoanthropologists excavate an artifact-rich portion of Cueva de los Aviones in Iberia. Fifty-thousand-year-old perforated and pigment-stained shells from the cave will prompt researchers to argue, 25 years later, that Neanderthals wore both makeup and jewelry.

Norman H. Sleep submits a paper calculating the probability of life forms surviving an extraterrestrial impact in the Hadean Period (first 700 million years of Earth's existence). The paper is rejected on the grounds there would have been no life on Earth yet.

Allan Wilson and Rebecca Cann announce that all humans share a common ancestor who lived in Africa as recently as 150,000 years ago. Because the discovery is based on examination of mitochondrial DNA, the ancestral entity will be given the popular (and somewhat misleading) name of "Mitochondrial Eve." The controversial finding will be supported by another discovery in 2000.

Jenny Clack finds Acanthostega, the most complete Devonian tetrapod yet discovered. It has evidence for functional gills as well as legs, strongly suggesting that animals evolved legs while still living in the water.

Kansas rancher Charles Bonner collects a plesiosaur mother-and-fetus fossil. Nearly 25 years later, O'Keefe and Chiappe will describe this as evidence that that plesiosaurs gave live birth and might have been attentive mothers.

Dhananjay Mohabey discovers what looks like a simple clutch of dinosaur eggs in India. Twenty-three years later, he, Jeffrey Wilson and colleagues will report that the fossil find includes not just sauropod eggs, but a predatory Cretaceous snake that apparently snacked on hapless sauropod hatchlings.

Molecular biologist John Cairns describes experiments suggesting that bacteria facing environmental stress can "direct" their mutations to produce favorable adaptations. Directed mutation will remain a controversial idea, but the possibility that organisms mutate at a greater rate (hypermutation) under environmental stress will gain more acceptance.

Sidney Altman and Thomas R. Cech share a Nobel Prize in Chemistry for their discovery of catalytic properties of RNA.

Ned Colbert finally completes his definitive species description of the Coelophysis dinosaurs he found in 1947.

Philip Gingerich finds a fossil whale, Basilosaurus in Egypt. It has tiny legs, just inches long, retaining all five toes. Five years later, he will discover an even more primitive whale ancestor, Rodhocetus, with even bigger hind legs, in Pakistan. Eighteen years later, Hans Thewissen will announce the discovery of another missing link in cetacean evolution: fox- like Indohyus found in Kashmir.