Covert and overt variation, as exemplified by British mouse populations / R.T. Berry -- The nature and significance of variation in wild populations / Kenneth Mather -- The extent of biochemical ...

Biological variation in populations is the process by which genetic and phenotypic differences arise, are maintained, and change in frequency among individuals within a species. It results from the ...

When species are subjected to changing environments, they can survive in their current location through genetic adaptation.

Disease and health are the result of a complex interaction between humans and their pathogens. Genetic factors that partly determine host defenses sometimes differ significantly between people and ...