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Honors Biology Ch. 14 Notes The Origin of Species Concepts of species 14.1 Define and distinguish between microevolution and macroevolution. microevolution: the changes over time in _____frequency in a population. macroevolution: the broader pattern of evolutionary change over _____________________________ . 14.2 Compare the definitions, advantages, and disadvantages of the different species concepts. Species Concept Biological Morphological Ecological Phylogenetic definition A group of populations whose members have the potential to interbreed in nature and produce fertile offspring. Based on observable and measurable physical traits such as shape, size, and other features of morphology (form). Focuses on niches and unique adaptations to particular roles in a biological community. The smallest group of individuals that shares a common ancestor and that forms one branch on the tree of life. advantages disadvantages Using reproductive isolation as the sole criteria is straightforward. A. Extinct organisms with only fossil evidence. B. Useless for prokaryotes (asexual) Most common. Can be applied to asexual organisms and fossils. Relies on subjective criteria. May look similar but distinguishable based on diet and location in environment. Requires close examination of behavior and habitat. History is traced by comparing its characteristics, such as morphology or DNA sequences, with those of other organisms. Agreeing on the amount of difference required to distinguish separate species remains a problem. 14.3 Describe five types of prezygotic barriers and three types of postzygotic barriers that prevent populations belonging to closely related species from interbreeding. table 14.3 p. 280 Mrs. Loyd [email protected] Page 1 of 3 http://loydbiology.weebly.com 5/25/2017 http://www.mybiology.com Mechanisms of Speciation 14.4 Explain how geologic processes can fragment populations and lead to speciation. Allopatric Speciation: “In another ________” 14.5 Explain how sympatric speciation can occur, noting examples in plants and animals. Sympatric Speciation: A new species arises ____________ _____________________________as a parent species. 14.6 Polyploidy: genetic isolation by ____________+ failure at _________ ________________. Less likely than the other two. Habitat differentiation: subgroups of original population evolved adaptations for exploiting different food sources. If in different habitats, mating between the two specializing populations would become rare, ___________ the gene pools. Sexual selection: F_______________ choose based on different factors. 14.10 Describe the circumstances that led to the adaptive radiation of the Galapagos finches. Adaptive Radiation: The evolution of many diverse species from a common ancestor. Example: Darwin’s Finches Typically occurs when a few organisms colonize new, unexploited areas or when environmental changes cause numerous extinctions, opening up a variety of opportunities for the survivors. Example: __________________________________ Many niches opened up. _______________ underwent dramatic adaptive radiation. Isolated ___________ __________ with physically diverse habitats are often the sites of explosive adaptive radiations. Colonizers may undergo multiple ___________and __________________ speciation events Producing species that are found nowhere else on Earth o Example: G_________________ Archipelago Great showcase of adaptive radiation Each island produced by __________ _______________ Ocean currents and winds brought stray plants, animals, microorganisms. Mrs. Loyd [email protected] Page 2 of 3 http://loydbiology.weebly.com 5/25/2017 http://www.mybiology.com 14.11 Compare the gradualism model and the punctuated equilibrium model of evolution. Explain how each model applies to the fossil record. Punctuated: many _________appear suddenly in fossil record and then… Equilibria: ________ _________ ____________through several layers (strata) until… Punctuated: disappearing as __________ as they appeared. One would not expect many _____________ ______________ in the record. Punctuated Equilibrium Gradualism: Other fossil species appear to have diverged _______ ___________________________________________ . D_________________ gradually evolve in populations as they become adapted to their local environments Gradualism Mrs. Loyd [email protected] Page 3 of 3 http://loydbiology.weebly.com 5/25/2017 http://www.mybiology.com