Biology 1001A Lecture : lecture
Document Summary
Identify mechanisms involved in a speciation and develop an appreciation of the importance of names of organisms in biology. Biological species concept defines a species as a group of an organism that can successfully interbreed and produce productive offspring. Phylogenetic species concept defines a species as a group of organisms bound by a unique ancestry. Ecological species concept defines a species as a group of organisms that share a distinct ecological niche. Hybridization, when two species interbreed and produce fertile offsprings. Asexually reproducing populations had a higher frequency of mutations in mitochondrial protein- coding genes than sexually reproducing populations. Populations of the same species are said to experience gene flow that mixes their genetic material and could be the glue holding a species together. The process of speciation is frequently defined as the evolution of reproductive isolation between populations. The biological species concept could explain why individuals of species generally look alike.