BI111 Lecture : Chapter 18.docx
Document Summary
Evolution is change in allele frequencies over time. Selection on variation in phenotypes (that has a genetic basis) results in changes at population (or species) level. Carl linneaus, aka the father of modern taxonomy and princeps botanicorum binary nomenclature: genus and species (a nested hierarchy) Species is a group of organisms that is biologically distinct from other and evolving along a lineage. What is a species often depends on what one of over twenty two species concepts you are using. A species concept is a set of conditions that are necessary and sufficient to identify a group of individuals as a species. Important to many biologists working in the fields of taxonomy, evolutionary biology, ecological and behavioural studies, and conservation biology. Morphological species concept main technique that linneaus used to identify species. Organisms are classified in the same species if they appear identical y morphological (anatomical) criteria. Species delineations based on notable differences in phenotype.
