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1 Biology Name: Date: Period: Evolution Review History of Evolutionary Thought Carl Linnaeus Published the first edition of his classification of living things, the Systema Naturae James Hutton Hutton proposes that Earth is shaped by geological forces that took place over extremely long periods of time. He cited volcanic eruptions, earthquakes, and erosion impacting geology now just as it had in the past. He estimates the Earth to be millions- not thousands- of years old Thomas Malthus In his Essay on the Principle of Population, Malthus predicts that the human population will grow faster than the space and food supplies needed to sustain it. Malthus reasoned that if the human population continued to grow unchecked, sooner or later there would be insufficient living space and food for everyone. He proposed that war, famine, and disease limited the growth of human populations Jean-Baptiste Lamarck Lamarck publishes his theory of the inheritance of acquired traits. The theory is flawed, but he is one of the first to propose a mechanism explaining how organisms change over time. Lamarck believed that organs could be altered in shape or size based on use or disuse. He believed that these acquired traits could then be inherited Charles Darwin Darwin sets sail on the HMS Beagle, a voyage that would provide him with vast amounts of evidence that lead to his theory of evolution Darwin realized that both living organisms and fossils were the key to understanding the natural world. The Galapagos islands were some of the most influential to Darwin and his theories. Darwin observed that the characteristics of many animals (tortoises and finches) and plants varied noticeably among the different islands of the Galapagos Charles Lyell In the second and final volume of Principles of Geology, Lyell explained that processes occurring now have shaped Earth s geological features over long periods of time Alfred Wallace Wallace writes to Darwin, speculating on evolution by natural selection, based on his studies of the distribution of plants and animals

2 Darwin presents Wallace s essay to the Linnaean Society Charles Darwin Publishes On the Origin of Species After years of compiling data and ideas, it was a colleague s paper on evolution (Alfred Russel Wallace) that pushed Darwin to complete and publish his own work. Darwin rejected the idea of species being perfect and unchanging in favor of natural variation. Darwin s greatest insight was to compare processes in nature with artificial selection. There are three key aspects of Darwin s Theory of Natural Selection: The Struggle for Existence - members of each species compete regularly to obtain food, living space, and other necessities of life. A key factor in the struggle for existence was an animal s fitness. Fitness the ability of an individual to survive and reproduce in its specific environment. Darwin proposed that fitness is the result of adaptations. Adaptation inherited characteristic that increases an organisms chance of survival Adaptations can be physical (i.e. shells, quills) or behavioral (i.e. group hunting) Survival of the Fittest Because each individual differs from other members of its species, each has unique advantages and disadvantages. Individuals with characteristics not well suited to their environment either die or leave few offspring. Individuals that are better suited to their environment survive and reproduce successfully. Descent With Modification Over time, natural selection results in changes in the inherited characteristics of a population. These changes increase a species fitness in its environment. Natural selection then produces organisms that have different structures, establish different niches, or occupy different habitats thus looking different from their ancestors. Thus each living species has descended, with changes, from other species over time a process Darwin called descent with modification. Thus if we look back far enough we could find a common ancestor for all living things; an idea know as common descent. Evidence for evolution Evidence for this process could be found in the fossil record,

3 the geographical distribution of living species, Beaver Beaver NORTH AMERICA Muskrat Muskrat Beaver and Muskrat Coypu Capybara Capybara SOUTH AMERICA Coypu and Capybara Coypu homologous structure of living organisms, and

4 similarities in early development. Population Evolution Evolution is a branching or splitting process in which populations split off from one another and gradually become different. It was not until around 1910 that biologists began to realize that genes were the key source of evolutionary change. There are two main sources of genetic variation: o Mutations o Gene Shuffling (the result of sexual reproduction) A gene pool is the combined genetic information of all the members of a particular population. The relative frequency of an allele is the number of times that allele occurs in a gene pool compared with the number of times other alleles occur (usually expressed as a percent). Keep in mind, natural selection acts on the phenotype of an organism (not its genotype). In small populations, individuals that carry a particular allele may leave more descendants than other individuals, just by chance. Over time, a series of chance occurrences of this type can cause an allele to become common in a population this is known as genetic drift. Natural selection can affect the distributions of phenotypes in any of three ways:

5 o Directional selection occurs when the environment of a population is changing in some definitive way (pepper moths). o Stabilizing selection is when individuals in the center of the population have higher fitness than either extreme. Stabilizing selection is the one mode that does not result in adaptive change and/or evolution. o Disruptive selection is when individuals at both extremes have higher fitness than individuals near the middle. Genetic equilibrium is the situation in which allele frequencies remain constant is called genetic equilibrium. If allele frequencies do not change, the population will not evolve. Five conditions are required to maintain genetic equilibrium from generation to generation: o There must be random mating o The population must be very large o There can be no movement into or out of the population o There can be no mutations o There can be no natural selection In addition to disruptive selection, new species can be created when segments of a population are separated. This separation creates isolated populations. There are various types of isolation: o Behavioral isolation - occurs when two populations are capable of interbreeding, but have differences in courtship rituals or other types of behavior. o By preventing the mating between formerly interbreeding groups or the inability of these groups to produce fertile offspring leads to reproductive isolation. o Geographic isolation is when a physical barrier is present which divides a population. o Temporal isolation is when two or more species reproduce at different times, this is called temporal isolation. Disruptive selection can lead to adaptive radiation where one species evolves into several. Speciation is the formation of new species Convergent evolution is a process by which unrelated organisms independently evolve similarities when adapting to similar environments. Coevolution is a process by which two species evolve in response to changes in each other. Many symbiotic relationships co-evolve over the course of their existence. In gradualism, organisms change slowly over time at a steady rate. In punctuated equilibrium, there are long periods of time with no change, followed by short periods of rapid evolution.

6 The Fossil Record The remains of ancient life are called fossils. Fossils occur in a particular order. Certain fossils in certain rocks. Over billions of years, ancient unicellular organisms have given rise to currently existing life on Earth. More than 99% of all species that ever lived on Earth are now extinct. Fossils include preserved forms of the following: Complete animals Animal fragments Eggs Footprints Animal droppings Plants or plant parts How We Use The Fossil Record (know table comparing!) Radioactive dating relies on half-life decay of radioactive elements to allow scientists to date rocks and materials directly. Relative dating provides a sequence of events from which relative dates can be extrapolated. Molecular clocks allow scientists to use the amount of genetic divergence between organisms to extrapolate backwards to estimate dates. Radioactive dating is the use of half-lives to determine the age of a sample. In radioactive dating, scientists calculate the age of a sample based on the amount of remaining radioactive isotopes it contains. In relative dating, the age of a fossil is determined by comparing its placement with that of fossils in other layers of rock. The rock layers form in order by age the oldest layers on the bottom, with more recent layers on top, closer to Earth s surface. To perform relative dating, scientists use index fossils to compare the relative ages of fossils. An index fossil is a species that is easily recognized and must have existed for a short period but in only a few layers of rock. In the absence of index fossils, scientists may use bracketing to date a particular layer of fossils. Fossils are generally found in sedimentary rock not igneous rock. Sedimentary rocks can be dated using radioactive carbon, but because carbon decays relatively quickly, this only works for rocks younger than about 60 thousand years. In order to date most older fossils, scientists look for layers of igneous rock or volcanic ash above and below the fossil. Scientists date igneous rock using elements that are slow to decay (uranium and potassium). By dating these surrounding layers, they can figure out the youngest and oldest that the fossil might be. Geologic Time Earth s early atmosphere probably contained hydrogen cyanide, carbon dioxide, carbon monoxide, nitrogen, hydrogen sulfide, and water.

7 Scientists Miller and Urey s experiments suggested how mixtures of the organic compounds necessary for life could have arisen from simpler compounds present on a primitive Earth. From these organic molecules arose RNA and DNA. Molecular biologists have discovered that RNA is very versatile and can actually under certain circumstances duplicate themselves. The endosymbiotic theory proposes that eukaryotic cells arose from living communities formed by prokaryotic organisms. Paleontologists use divisions of the geologic time scale to represent evolutionary time. This time scale was originally developed as geologists studied rock layers and index fossils. Changes in the fossil record were used to mark where one segment ends and another begins long before these segments were assigned dates. Later radioactive dating was used to determine time frames for these shifts. Precambrian Time - Anaerobic, then photosynthetic prokaryotes; eukaryotes, then multicellular life Paleozoic Era Age of Fishes Cambrian Marine invertebrates diversified; most animal phyla evolved Ordovician Aquatic arthropods; mollusks; vertebrates (jawless fishes) Silurian First land plants; first land animals (arthropods) Devonian Fishes diversified; land vertebrates colonize and begin to diversify (primitive amphibians) Carboniferous First reptiles; winged insects diversified; coal swamps Permian Reptiles diversified; seed plants; mass extinction Mesozoic Era Age of Reptiles Triassic First dinosaurs; small mammals; cone-bearing plants Jurassic Dinosaurs diversified; birds Cretaceous Aquatic reptiles diversified; flowering plants; mass extinction Cenozoic Era Age of Mammals Tertiary Mammals diversified; grasses Quaternary Glaciations; mammals increased; humans Extinctions occur all the time. More than 99% of all species that ever lived are now extinct. Mass extinction is an episode in which many species suddenly become extinct Classification Linnaeus was a Swedish botanist who developed a classification system for the living world that included seven different levels of order. These are:

8 1. Kingdom 2. Phylum 3. Class 4. Order 5. Family 6. Genus 7. Species These groups or levels of organization are called taxons. Thus the term taxonomy for the discipline of classification and naming of organisms. Linnaeus also gave us a two-part naming system called binomial nomenclature. This system provides a scientific name that described the organism using its genus and species. Traditional classification groups organisms based on their physical traits. Cladograms group organisms based on their evolutionary history (physical traits & DNA similarity) Appendages Conical Shells Crustaceans Gastropod Crab Barnacle Limpet Crab Barnacle Limpet TRADITIONAL CLASSIFICATION Molted exoskeleton Segmentation CLADOGRAM Tiny free-swimming larva Characteristics found in recent lineages but not older members are called derived characters. Vestigial traits are largely or entirely functionless (a hold over from earlier evolutionary forms). A vestigial structure may retain lesser functions or develop minor new ones. A model known as a molecular clock uses DNA comparisons to estimate the length of time that two species have been evolving independently Currently there are three domains that scientists identify relating life on earth. Bacteria Archaea Eukarya

9 Scientists currently recognize six different kingdoms. Eubacteria (Bacteria) Archaebacteria (Archaea) Protista (Eukarya) Fungi (Eukarya) Plantae (Eukarya) Animalia (Eukarya)

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