1. Darwin’s Principles

2. Darwin’s finches Differences in beaks allowed some finches to…
________________________________
________________
pass successful traits onto their offspring

3. In historical context
Other people’s ideas paved the path for Darwin’s thinking
competition:
struggle for survival population growth exceeds food supply
land masses change over immeasurable time

4. “On the Origin of Species by Means of Natural Selection”
Voyage:
November 24, 1859, Darwin published
“On the Origin of Species by Means of Natural Selection”

5. Essence of Darwin’s ideas
__________________________
___________________ exists in populations
_________________________________
more offspring than the environment can support
for food, mates, nesting sites, escape predators
successful traits = ________________________
adaptations become more common in populatio

6. Where does Variation come from?
_____________________
random changes to DNA
_______________________________
environmental damage
mixing of alleles
______________________________
new arrangements of alleles in every offspring
new combinations = new phenotypes

7. LaMarckian vs. Darwinian view
in reaching higher vegetation giraffes stretch their necks & transmits the ____________ longer neck to offspring
Darwin
giraffes born with longer necks survive better & leave more offspring who ______________ their long necks

8. Stick your neck out… Ask Questions!