PPT-ISOLATION EQ : What are the types of isolation that lead to speciation?

Reproductive isolating mechanisms Prezygotic isolating mechanisms Geographic isolation Ecological isolation Behavioral isolation Temporal isolation Mechanical isolation Prevention of gamete fusion. What is a Species?. Speciation. – the origin of new species. The . biological species concept. defines a species as a population or group of populations whose members have the potential to interbreed with one another in nature to produce viable, fertile offspring, but who cannot produce viable, fertile offspring with members of other species. The rise and fall of biodiversity. Four major . mass extinctions . of marine organisms:. End of Silurian Devonian, Permian, and Cretaceous). Rise in diversity during Cambrian, Silurian, Cretaceous, and Paleogene. Evolution. Results of evolution. New species (speciation). Causes of evolution. Barriers between same species (gene pools). Geographical isolation -> leads to . allopatric. speciation. Temporal isolation -> leads to sympatric speciation. FIFTH EDITION. CHAPTER. . 19. Speciation and the Origins. Of Biological Diversity. © . 2012 W. W. Norton & Company, Inc.. Anu Singh-Cundy • Michael L. Cain. Cichlid Mysteries. Earth’s changes separate populations of organisms, alter the environments in which they live, and set the stage for evolution. Macroevolution is essentially the formation of new species (speciation) and accompanying events. . Reproductive isolation can occur in a variety of ways. Reproductive isolation is the key to cladogenic speciation. Evolution. Speciation Basics. Individuals of different species cannot . interbreed. under natural conditions . Described as being . reproductively isolated . from one another. Populations of different species do . Meara. EEB464 Fall . 2017. http://www.youtube.com/watch?v=lopTMhAbXoI. Learning objectives. Understand factors that can lead to speciation. Consider the geography of speciation. Describe approaches to . Species. == “kind” or “type” in Latin. Typological . (morphological) species. . == a group of organisms that share certain characteristics which are different than other groups—usually differences in anatomy. . Temporal – crickets mature at different times. Prezygotic. isolation. Habitat – land vs. water garter snakes. Prezygotic. isolation. Behavioral – firefly mating. Prezygotic. isolation. Gametic. Learning Goal: . To explore the factors leading to the evolution of a new species. . Success Criteria:. I know I am succeeding when I can… . define the concept of speciation. identify the modes of speciation. I. Species Definitions. Species represent the boundary for the spread of alleles . and define the unit in which the modes of evolution operate. Biological Species Concept. Individuals belong to the same species if they can interbreed with each other. Outcomes of Evolution Selection acts on Variation Directional Disruptive Stabilizing Genetic variation Directional Selection Favors one of the extreme variations of a trait Finish vocabulary cards from yesterday. VOCABULARY QUIZ NEXT MONDAY!. TEST NEXT THURSDAY! -4 MORE DAYS!. Types of Speciation, Evolution & Isolation. Thursday. January 22nd . Currently there are . Populations must become isolated. Reproductive isolation is key!. Once isolated, populations will evolve independently (different factors affecting each). Two types of speciation. allopatric. geographic separation.