The unexpected discovery of a new type of genetic variation suggests that natural selection -- the force that drives evolution -- is both more powerful and more complex than scientists have thought.

The red area denotes the current frequency distribution of a trait that is carried by individuals in a population. The yellow area denotes the same distribution for a past generation. If there is ...

Human embryonic stem cells can be genetically manipulated to help select out desirable cell types, according to a new study. This advance could help scientists develop better ways of deriving useful ...

Human genetic diversity is the result of population genetic forces. This genetic variation influences disease risk and contributes to health disparities. Autoimmune diseases (ADs) are a family of ...

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A selection experiment to develop reproductive isolation intraspecifically was conducted with maize, Zea mays L. Two populations, a white flint and a yellow sweet maize having different recessive ...

The population of Medium Ground Finches (Geospiza fortis) on I. Daphne Major. Galápagos was studied between 1979 and 1981. During this period adult males outnumbered females by two or three to one as ...