Genetic variation describes naturally occurring genetic differences among individuals of the same species. This variation permits flexibility and survival of a population in the face of changing ...

The genus Rhoadsia is endemic to western Ecuador and northern Peru and includes two described species that differ in body form, size, and the elevations at which they occur. Unfortunately, there is ...

American Journal of Botany, Vol. 98, No. 9 (September 2011), pp. 1511-1519 (9 pages) Premise of the study: The patterns of genetic structure in plant populations are mainly related to the species life ...

Mexican researchers examined the polymorphisms of three enzymes -- alcohol dehydrogenase (ADH1B), aldehyde dehydrogenase (ALDH2) and cytochrome P4502E1 (CYP2E1) -- in the Mestizo and Huichol ...

A new study shows that facial differences resulting from population divergence in first Americans is due to the complex interaction of environment and evolution on these populations and sheds light on ...