BILD 3 Lecture Notes - Lecture 6: Allopatric Speciation, Sympatric Speciation, Cladogenesis
Document Summary
Two basic patterns of evolutionary change can be distinguished. Defines a species as a population or group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring but are unable to produce viable fertile offspring with members of other populations. Focuses the study of speciation on the study of the evolution of reproductive isolation. Is the existence of biological factors that impede members of two species from producing viable, fertile offspring. Is a combination of various reproductive barriers that may operate either before or after fertilization. Some species hybridize frequently but maintain their differences elsewhere. Biologists often disagree as to whether such situations represent two species or one species with two ecotypes. The biological species concept cannot be applied to. Organisms about which little is known regarding their reproduction. Morphological terms of body shape, size and other structural features. Paleontological focuses on discrete species known only from the fossil record.
