September Journal: What is a theory? Are theories always true?

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A Closer Look At Darwin’s Idea of Natural Selection

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Presentation transcript:

September Journal: What is a theory? Are theories always true?

Evolution

Evolution Definition Process of genetic changes occurring within a population over many generations

Charles Darwin: The Father of Evolution A. Darwin was NOT the first person to propose evolution… B. He did propose a way evolution happens called Natural Selection

Theory of Evolution by Natural Selection Over time, the number of individuals that carry an advantageous trait in a population will increase Success of the trait depends on the environment that the organism lives in

Examples of Natural Selection

Requirements of Natural Selection Overproduction of offspring

Requirements of Natural Selection Genetic Variation within a population

Requirements of Natural Selection Struggle for existence

Requirements of Natural Selection Differential Survival and Reproduction Over time, the traits that improve fitness will become more common. Fitness: The ability for an organism to survive and reproduce.

Types of Adaptations Physical Adaptations Behavioral Adaptations Warning Coloration Mimicry Behavioral Adaptations Horned Lizards Octopus