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Transcript
Darwin’s Theory of Natural Selection EQ: How does evolution occur? Date:1-27-16 Spiral pg. What important observations did Darwin make on his voyage? What is a theory? How does Natural Selection work? Darwin’s Observations ► Darwin made many observations as he sailed the HMS Beagle to the Galapagos Islands: Diversity of living things Fossil bones of animals that died long ago ►A fossil is the preserved remains or traces of an organism that lived in the past. Adaptations, a trait that helps an organism survive and reproduce in its environment Examples: Bird Beaks Natural Selection ► Darwin proposed that evolution occurs through a mechanism called Natural Selection. Natural Selection, individuals that are better adapted to their environment are more likely to survive and reproduce than other members of the same species Evolution ► Darwin’s Reasoning: Darwin’s ideas are referred to as the theory of Evolution Evolution, the gradual change in a species over time A Scientific Theory is a well-tested concept that explains a wide range of observations. Factors of Natural Selection Factors of Natural Selection 1. Overproduction: organisms produce more offspring than will survive. EX: sea turtles & insects 2. Variations: differences among individuals. 3. Competition: organisms compete for resources. 4. Selection: those organisms with the best adaptations will survive and reproduce. Evolution ► Selective Breeding: The process of modification of a species through human actions which encourage the breeding of certain traits over others Examples: Dogs . Complete on p. 110 in your notebook Make a Flow Chart To demonstrate The factors of Natural Selection Over Production Variations Competition Selection Survival and Reproduction