EvolutionLectureNotes

EvolutionLectureNotes - Evolution and the Fossil Record The...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Evolution and the Fossil Record The Study of Evolution Two domains: the present and the past The present: Biology Genetics Comparative Anatomy The past: Paleontology or Paleobiology Comparative Anatomy of Fossilized organisms Natural Selection Natural selection, a creative force, is one of the prime mechanisms of evolutionary change. (The other mechanism, a destructive force is mass extinction.) Charles Darwin, 1859: The Origin of Species by Natural Selection . Natural Selection: Key Points 3 facts lead to a conclusion: Fact 1. Overproduction of offspring Fact 2. Variation within populations Fact 3. Competition for resources Conclusion: Survival of the fittest Sources of Variation Random mutations of DNA >>99.9% are harmful or neutral adaptive mutations are rare Sexual recombination new variants created by mixing of genes you have 4096 direct ancestors going back 12 generations (2 12 )
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Evidence of Evolution Homology Analogous organs or Convergent Evolution
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 4

EvolutionLectureNotes - Evolution and the Fossil Record The...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online