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Western University
Biology 1001A
Tom Haffie

Lecture 16Notes Section 182187181 Whats in a Name identify mechanisms involved in a speciation and develop an appreciation of the importance of names of organisms in biology182 definition of species 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 nicheHybridization when two species interbreed and produce fertile offspringsAsexually reproducing populations had a higher frequency of mutations in mitochondrial proteincoding 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 togetherThe process of speciation is frequently defined as the evolution of reproductive isolation between populationsThe Biological Species Concept could explain why individuals of species generally look alike If phenotype reflects genotype members of the same gene pool should share genetic traits genotype that determine phenotype Individuals of different species generally do not resemble one another as closely becasuse they share fewer genetic characteristicsBiologists often use similarities or differences in morphological traits as convenient markers of genetic similarity or reproductive isolationBiologists use visible morphological traits to allow other biologists to distinguish the new species from the previous known speciesMorphological species Concept the idea that all individuals of a species share measurable traits that distinguish them from individuals of other species Palaeontologists use morphology to identify fossils to species but also depend on information about the fossils age
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