Research Article: Host Immunity Escalates the Evolution of Parasite Virulence

Date Published: September 22, 2004

Publisher: Public Library of Science

Author(s): unknown

Abstract: None

Partial Text: Strictly defined, evolution is a change in the gene pool, or total set of genes, of a given population over time. Genetic changes that increase the fitness of an organism—that is, increase survival or fertility—are more likely to be retained, through natural selection, and passed on to succeeding generations. In the classic case of Darwin’s finches, different ecological niches exerted different selective pressures on an original population, and resulted in 14 different species, each sporting a beak uniquely adapted to harvesting particular available food sources.



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