Theory of Evolution. Chapter 15
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1 Theory of Evolution Chapter 15
2 The History of Evolutionary Thought Evolution The development of new types of organisms from preexisting types of organisms over time. Also could be described as a heritable change in characteristics within a population from one generation to the next
3 The History of Evolutionary Thought Darwin s Ideas Used the phrase descent with modification to describe the process of evolution Every species, living or extinct, must have descended by reproduction from preexisting species and that species must be able to change over time.
4 Theory of Natural Selection (Darwin) 1. Overproduction More offspring are produced than can survive to maturity 2. Genetic Variation Within a population, individuals have different traits. Ex: Thick fur Occasionally, new traits may appear in a population
5 Theory of Natural Selection (Darwin) 3. Struggle to Survive Individuals must compete with each other Some variations improve an individuals chances to reproduce, but some variations reduce this chance. 4. Differential Reproduction Organisms with the best adaptations are likely to survive and reproduce Through inheritance, the adaptations will become more frequent in the population
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7 Evidence of Evolution Fossil the remains or traces of an organism that died long ago. Show that different types of organisms appeared at different times and places on earth.
8 Superposition this principle states that if the rock strata at a location have not been disturbed, the lowest stratum was formed before the strata above it.
9 Geologists put together a timeline for the order in which different groups of rocks and fossils were formed. The Geologic Time Scale Relative age its age compared to that of other fossils. Absolute age more accurate using radiometric dating Not all fossils are discovered and not all remains become fossilized
10 Distribution of Fossils 1. Different organisms lived at different times 2. Today s organisms are different from those of the past 3. Fossils found in adjacent layers are more like each other than fossils found in deeper or higher layers. 4. By comparing fossils and rocks from around the planet, we can infer when and where different organisms existed. 5. Species have differed in a gradual sequence of forms over time.
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12 Transitional Species Have features that are intermediate between those of hypothesized ancestors and later descendant species. Example Page 304
13 Anatomy and Embryology Homologous structures anatomical structures that occur in different species and that originated by heredity from a structure in the most recent common ancestor of the species.
14 Anatomy and Embryology Analogous structures have closely related functions but do not derive from the same ancestral structure.
15 Anatomy and Embryology Vestigial structures seem to serve no function but that resemble structures with functional roles in related organisms.
16 Anatomy and Embryology The development of animal embryos is also evidence of descent with modification
17 Biological Molecules Biologists can compare the DNA, RNA, proteins, and other biological molecules from many different organisms. They can then look for similarities and differences among the data for each species The greater the number of similarities between any given species, the more closely the species are related through a common ancestor.
18 Evolution in Action Convergent Evolution process by which different species evolve similar traits.
19 Divergent Evolution process in which the descendants of a single ancestor diversify into species that each fit different parts of the environment.
20 Adaptive radiation sometimes, a new population in a new environment, such as an island, will undergo divergent evolution until the population fills many parts of the environment
21 Artificial Selection this process occurs when a human breeder chooses individuals that will parent the next generation.
22 Co-evolution when two or more species have evolved adaptations to each other s influence. Ex: Bacteria and humans resistance
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