Palaeos: Main Glossary Palaeos: Main Glossary

Tabulate the differences between relative and radiometric dating of fossils,

Compare with evolutionary classification and phenetic classification. The order of events according to time. When present in the atmosphere, these gases contribute to the greenhouse effect, trapping heat near the surface of the planet.

Her best-known publication, Silent Spring, was written over the years to Also, a synonym for analogy ; that is, an instance of a convergently evolved character, or a similar character in two species that was not present in their common ancestor.

The reproductive cells in an organism, or the cells that produce the gametes. They are mollusks with tentacles and move by forcing water through their bodies like a jet.

In population genetics, the idea that if a population experienced no selection, no mutationno migration, no genetic driftand random mating, then the frequency of each allele and the frequencies of genotype in the population would remain the same from one generation to the next.

Philosopher and director of the Center for Cognitive Studies at Tufts University, whose work unites neuroscience, computer science, and evolutionary biology.

All cells in an organism can be divided into the soma the cells that ultimately die and the germ cells the cells that are perpetuated by reproduction.

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The process by which a similar character evolves independently in two species. The "Cambrian", the classical name for Wales and the "Ordovician", and "Silurian", named after ancient Welsh tribes, were periods defined using stratigraphic sequences from Wales.

These invertebrates are very common in the global ocean, and their distinctive, chambered shells are common in the fossil record as far back as million years. The tendency of like to mate with like. In phylogenetic studies, a character is a feature that is thought to vary independantly of other features, and to be derived from a corresponding feature in a common ancestor of the organisms being studied.

British intellect, photographer, and contemporary of Darwin. An ancestor-descendant sequence of 1 populations, 2 cells, or 3 genes. The prokaryotic organisms once lumped into the kingdom Monera are now considered to belong to separate domains: At certain times in the cell cycle, chromosomes are visible as string-like entities.

Historically influential but factually erroneous theory that an individual inherits characters that its parents acquired during their lifetimes. Ancestor in this context, an organism, or more correctly a populationlineageor speciesthat through evolution gives rise to one or more descendants that generally belong to a distinct species or lineage.

It was thus possible to speak of a "Tertiary Period" as well as of "Tertiary Rocks.

Their glassy, two-part shells have intricate patterns and fit together like the two parts of a shirt box. His research includes work on Lucy Australopithecus afarensis.

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Compare Deep TimeUniverse Story. A paleontologist and founder of the Institute for Human Origins.

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A physician and world-renowed AIDS researcher. Her primary research interests concern various facets of marine biodiversity.

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Homology that first evolved in the common ancestor of a set of species and is unique to those species. FitzRoy's chief mission on the Beagle was to chart the coast of South America.