PPT-Agents of Evolution Macroevolution Microevolution

Evolution of one ancestral species to new distinct species Happens over a long period of time evidence relies on fossils Relies on Microevolution Changes in the gene pool of one species that gives rise to variation in one species. Brian O. ’. Meara. EEB464 Fall . 2015. http://www.youtube.com/watch?v=b97sBw-sRNM. Stork. Insect diversity: facts, fiction, and speculation. Biological Journal of the Linnean Society (1988) vol. 35 pp. 321-337. Microevolution is a change in allele frequencies or genotype frequencies in a population over time. Genetic equilibrium in populations: the Hardy-Weinberg theorem. Microevolution is deviation from Hardy-Weinberg equilibrium. David Hales & Shade Shutters. The Open University & Arizona State University. www.davidhales.com. Santa Fe, NM, Thursday, Dec 6th. For more details and references see:. http://davidhales.com/papers/complex2012.pdf. 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. Changing Allele Frequencies. Evolution. Evolution is defined as a change in the inherited characteristics of biological . populations. over successive generations. . Microevolution involves the change in allele frequencies that occur over time . M. olecular . B. iology . E. vidence. Leonard Brand, PhD. Professor of Biology and Paleontology. Department of Earth and Biological Sciences. Loma Linda University. History of scientific advance. Darwin. Macroevolution/Microevolution. Macroevolution- One g. roup of animals. evolves into another….due to . large. scale changes that take place over . long. . periods of time.. . Microevolution- . Small. DARWIN’S UNDERSTANDING VS. PRESENT DAY. How are inheritable traits passed?. How do variations appear?. Today’s understanding of genes, DNA, variation, and mutations is central to our understanding of how evolution works . Sympatric Speciation. Sympatric Speciation occurs . without. geographic isolation, thus it occurs at a local level. . There is something within the environment that keeps a single species separated into two or more distinct groups.. Leonard Brand. Professor of Biology and Paleontology. Department of Earth and Biological Sciences. Loma Linda University. Goal of this talk:. Evaluate the current state of the evidence for the evolution of life forms by random mutation and natural selection. B. iology . E. vidence. Leonard Brand, PhD. Professor of Biology and Paleontology. Department of Earth and Biological Sciences. Loma Linda University. History of scientific advance. Darwin. (mid-1800’s). foods, . and are usually used in baked . goods.. Raising . agents are added to baked products during the . preparation stage. . They . create . gas, air . or . steam which expands when heated and causes the food to rise. . The Scale of . Evolution. Microevolution. Microevolution . occurs over a relatively short period of time within a population or species. The Grants observed this level of evolution in Darwin’s finches which will be discussed later in this lesson.. Bread:. Dough contains . yeast. , which ferment sugars to . carbon dioxide. . Further expands on baking.. Scones:. Made with . baking powder . that reacts with water to form . carbon dioxide. Choux buns.