Sentences with phrase «isolated populations occurring»

Range The Townsend's big - eared bat occurs throughout the west and is distributed from the southern portion of British Columbia south along the Pacific coast to central Mexico and east into the Great Plains, with isolated populations occurring in the central and eastern United States.

Not exact matches

Change can also occur due to accidental loss of alleles (genetic drift) in small isolated populations.

These occur in geographically isolated populations descended from early pastoralists who lived in different parts of Africa and Eurasia.

The Texas and English Cimoliopterus cousins are different species, so some evolutionary divergence occurred, indicating the populations were isolated from one another at 94 million years ago, Myers said.

For a population isolated in a new environment, rapid selection can lead to speciation, and in the Lower Cambrian, to radically new forms that we now group in the Phyla of modern times occured to an unprecedented extent that has never since been repeated.

The mechanisms by which speciation occurs have been a mystery because they are generally best uncovered after populations have diverged and are reproductively isolated....