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Darwin’s Theory of Evolution

Darwin’s Theory of Evolution. The History of Evolution. Evolution is defined as _________ over time The theory that all organisms on Earth are related by __________ __________ and that they have changed over time (adapted) mostly because of __________ __________.

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Darwin’s Theory of Evolution

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  1. Darwin’s Theory of Evolution

  2. The History of Evolution Evolution is defined as _________ over time The theory that all organisms on Earth are related by __________ __________ and that they have changed over time (adapted) mostly because of __________ __________. __________ __________ is one of the most famous scientists associated with the theory of evolution

  3. Darwin’s interest Darwin’s observations and research played an important role in the development of the theory of evolution that is still __________ __________ today During his voyage on the U.S.S. Beagle, he would collect specimens from the different areas he visited He was fascinated to see the variety in the different plants and animals that he studied

  4. He did notice one similarity: All of the organisms he observed were well suited (well matched) to their _______________

  5. Adaptation • An adaptation is any __________ ____________ that increases an organisms chance for __________ • Adaptations can be __________ or __________ and can be passed from generation to generation • The process of becoming __________ __________ to the environment

  6. Different types of adaptations: • Genetic adaptation – always genetically controlled (ex: 5 fingers, giraffe’s neck)

  7. Different types of adaptations: • Physiological adaptation – change in the reactions; can be genetic or not (ex: acclimation to altitude or climate, coat color change during seasons)

  8. Different types of adaptations: • Behavioral adaptation – change in behavior; can be genetic or not (ex: chimps using sticks to catch termites, bears eating garbage)

  9. Survival of the fittest • The ability of an individual to __________ and __________ is called __________ • Adaptations that help an animal become more fit to __________ and __________ more ____________ are commonly selected • This is known as __________ ___ ___ __________

  10. Survival of the fittest is also known as __________ __________ Over time, natural selection will change the ____________ of a population, increasing the __________ of that population

  11. Proof? You want proof? • Evidence of evolution through adaptation and natural selection can be found in: • the __________ __________ • ____________ ____________ (different animals __________ similarly because of the same _______________ factors) • _______________ structures • Similarities in early development of ___________

  12. TODAY… • Evolution is widely accepted by the scientific community • Theories are constantly changing based on new evidence (mitochondrial DNA, rapid evolution…) • Evolution is still occurring • Many species are becoming extinct because they cannot evolve as fast as humans are changing the environment. • Humans are “meddling” with evolution through artificial selection (fruit, dogs…)

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