Darwin & Evolution Change Happens…
Evolution • History and prehistory are full of creation stories • People have always guessed at how they “got here”
Evolution • Greeks • Hypothesized ______________________was related to _________________
Evolution • Charles Bonnet • Because fossils rarely looked like modern organisms, there must have been catastrophes after which new life arose • ___________________________________
Evolution • Jean Baptiste Lamarck • Believed ___________________________ • Wrote: ________________________________________ • His work later influenced Darwin.
Evolution- Lamark • ____________________________________________ • Most used structures develop & others waste away • Once a structure is modified it is inherited
Evolution • Weismann • _____________________________________________ with tests on mice • Change in an individual’s life time does not get passed on
Charles Darwin • 1831 ____________________sailed around the world • Arrived at the _______________________
Charles Darwin • Intrigued by the _____________and their __________________________
Charles Darwin • Used _______________________________of slow and gradual change. • Used the ideas of __________________for domesticated animals
Charles Darwin • Thought these processes of change must happen in ____________________________
Charles Darwin • ___________________________________: • (Human) populations that exceed their resources will decline due to war, famine, disease, etc. this must also happen in the wild.
Charles Darwin • Reasoned __________________________ live because it would lead to overpopulation • The ones who were ________________________ _______________would survive
Charles Darwin • The survivors would be the ones to reproduce and pass down the traits that enabled it to survive • _________________________________________
Darwin’s Theory of Evolution • Challenged the popular belief at the time (creation/church) • He held off on publishing it • __________________________came up with a similar theory after working in the Amazon and the Malaysia & Indonesia • They published them together • Wallace gave Darwin all the credit • ___________________________________________________
Darwin’s Theory of Evolution • ________________: Not all young in each generation can survive (disease, starvation, predation, etc) • ________________: There are variations in all populations that are passed on genetically • _____________________: Some variations are favorable – these are adaptations • ______________________: Individuals that survive and reproduce are the ones with favorable variations ___________
Remember! • _______________________________________ ____________; it is independent and happens during genetic recombination • A variation only becomes an adaptation when it is favorable in the current environment.
Divergent evolution • Descendants of a single ancestor diversify because of __________________________.
Adaptive Radiation • One species spreads out to fill __________ _______________________ • Hawaiian Honey Creepers
Convergent Evolution • Analogous adaptations occur in response to __________________
Coevolution • The adaptation of _____________________________ over time
Evolution • Can result in speciation – the formation of a new species from an existing one