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Biological species concept, phenetic species concept, reproductive competition species concept, evolutionary species concept, and the recognition species concept.
Fossil species cannot be defined with the genetic definition. But then that's also true of most of the species that biologists define among living organisms.
The main difference between the typological species concept and the morphological species concept is that the typological species concept classifies organisms that share characteristics that set them apart from others, whereas the morphological species concept classifies them as the same species if they appear identical.
Ecological species concept.
The morphological species concept differentiates species by their physical traits, basically. The biological species concept defines a species as generally organisms that breed with others of the same species; rather a genetic isolation concept. The phylogenetic concept is based on evolutionary relationships and is the concept used by cladists.
Comparision of mhoperlogical And biological species concept
some bacteria...
By the fixed alleles in the species
Species (under the Biological Species Concept).
Organisms are the same species if the have the potential, or actually interbreed one with another. Does not apply to all organisms. Bacteria being an example of this. Is not as strong a concept as once it was as it did not adequately address hybridization.
According to the biological species concept, two organisms are of different species if they do not do which of these
From the concept of a point, one can define a line. Once the concept of a line is defined, one can define a plane. From the concept of a plane, any higher dimension geometrical object can be defined, e.g. a volume.