Small mutations in these controller genes could produce new species.

Some have thought that artificial selection could not produce new species.

In the 1920s, the island was used as a fish hatchery to produce such species as shad.

They provide the material that is worked upon by the forces of natural selection to produce new species and new varieties within species.

Evolution can't produce new species on demand.

Maupertuis wrote in 1751 of natural modifications occurring during reproduction and accumulating over many generations to produce new species.

In biology and agriculture, radiation is used to induce mutations to produce new or improved species.

Since fisheries produce only certain species of fish, these monoculture populations are especially vulnerable to threats.

Some scientists have presented evidence that the process has produced several species of plants and animals, but their ideas have met with intense skepticism.

Andaman forests contain 200 or more timber producing species of trees, out of which about 30 varieties are considered to be commercial.