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On your piece of paper. Write out your definition of evolution. Explain whether you accept this idea or not, and provide an explanation. Introduction to Evolution. Chapter 15.1. What is evolution?. Evolution is defined as descent with modification

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on your piece of paper
On your piece of paper
  • Write out your definition of evolution.
  • Explain whether you accept this idea or not, and provide an explanation
what is evolution
What is evolution?
  • Evolution is defined as descent with modification
    • The change in the genetic makeup of populations of organisms over time
  • The processes that we will discuss related to evolution explain how the organisms present on earth today descended from those that were present here in the path.
what we are not talking about
What we are not talking about…
  • Nothing that we will cover in this unit should be at odds with you personal beliefs.
  • We are simply discussing how the genetics of living organism’s change over time.
what do we know
What do we know?
  • There are many different creatures on Earth
  • How do we know this?


What accounts for all this biological diversity?

what do we know1



What do we know?
  • All creatures have common characteristics
  • How do we know this?


Unity of Life on Earth

How could all of life have the same basic features?

what do we know2
What do we know?
  • Creatures have changed over time
  • How do we know this?


Fossil Record

evolution explains unity diversity


Evolution explains Unity & Diversity
  • Only evolution explains both
    • unity of life
      • similarities between all living things
    • diversity of life
      • wide variety of different creatures on Earth
addressing important misconceptions
Addressing Important Misconceptions
  • Evolution happens to a population, not to an individual.
  • Evolution does not result in a “better” form of a life.
  • Evolution does not necessarily occur slowly.
  • A “species” is not distinct from all other organisms.
ideas that shaped the theory of evolution
Ideas that shaped the theory of evolution
  • 1795- James Hutton published a book that detailed how geologic processes might shape the surface of the earth
    • Discussed forces that both created and eroded the earths surface.
    • Acknowledged that these processes happen very slowly in most cases (erosion)
    • Proposed that the Earth was more than a few thousand years old.
lyell s principles of geology
Lyell’s Principles of Geology
  • 1830’s- Charles Lyell explained how geologic features could be built up or torn down over time.
  • Once again emphasized how the earth changes over long periods of time.
    • Why shouldn’t organism’s also change?
lamarck s theory of evolution
Lamarck’s Theory of Evolution
  • 1809- Jean-Baptiste Lamarck was one of the first scientists to recognize that species changed over time
    • All species descended from other species
    • Organisms are adapted to their environment
lamarck s theory
Lamarck’s Theory
  • “By selective use or disuse of organs, organisms acquired or lost certain traits during their lifetimes. These traits could then be passed on to their offspring. Over time, this process led to change in a species.”
components of lamarck s theory
Components of Lamarck’s Theory
  • Tendency Towards Perfection
    • All organisms are attempting to become more complex and acquire features that make them better suited to the environment.
  • Use and Disuse
    • Organisms can alter the size/shape of their bodies by using them in new ways.
  • Inheritance of Acquired Traits
    • The new traits, created by behavior are passed on to offspring
issues with lamarck
Issues with Lamarck
  • If you lift a lot of weights, your children won’t be born with big muscles.
  • No matter how much I flap my arms, they won’t become wings.
  • Mr. Johnsons isn’t tall because his parents were always reaching for things on high shelves.
  • While traits are heritable, an organism lacks the ability to evolve in its lifetime.