Abstracts » Science and technology

Starting species with third parties and sex wars

Article Abstract:

Modern methods of genetic research have produced evidence that there are many factors in addition to geographic isolation that cause new species to develop. These factors include the intervention of a third organism, variations in fertilization and hybridization.

Evolution, Hybridization

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Proteins 'clock' the origins of all creatures - great and small

Article Abstract:

Molecular biologist Russell F. Doolittle and his colleagues have devised a 'molecular clock' to determine when groups split off from common ancestors. The clock indicates that eukaryotes split off from prokaryotes about 2 billion years ago.

Innovations, Eukaryotic cells, Cells (Biology), Eukaryotes, Origin, Chemical evolution, Molecular evolution, Doolittle, Russell F.

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On the many origins of species

Article Abstract:

Research on apple maggots and other animal species has produced convincing evidence of a process called sympatric speciation. Most scientists had formerly dismissed the theory that new species could form without geographic isolation.

Natural history, Amazon River region, Isolating mechanisms

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