continuing the line genes mating rituals chemical signals multiple mates competition
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Continuing the line Genes
Mating rituals
Chemical signals
Multiple mates
Competition
As the 19th century came around it was generally thought that species remained unchanged since their creation.• However this was about to face one
thunderstorm change of thought
In the battle of Natural Selection against the
Inheritance of Acquired Traits
Youngest of eleven kids
Military family
Expert in plants of France
Philosophie Zoologique, book
Continued with research, living a poor's mans life
Species never become extinct instead they continue to change over time
Animal species change over time, due to the changes in their environment
Change occurs not by chance
1. Tendency toward perfection• If an animal wanted to change something, it
could• Through the study of fossils species started
out simple and moved toward complexity
2. Use and Disuse• If you don’t use it you will lose it
3. Inheritance of acquired traits• Changes made during an animal’s life could
be passed down to its offspring
Using it=perfection! Not using it=lose it!
Always enjoyed science growing up but wasn’t fit for medical school• Sent to Cambridge with the
intention on becoming a clergyman
Loved sports and entomology
Almost didn’t make the voyage on the Beagle as the ships naturalist
1. Change over time • Pre-existing variation
2. Variation within a population or species• Everyone is just a little different
3. Natural selection Adaptations
• Survival of the fittest 4. All connected to the environment
1. Organisms have changed over time.
2. Organisms changed because they wanted to survive.
3. There was variation in a population. (everyone was a little different)
4. Certain traits helped organisms survive and reproduce better than other organisms without those traits. (all about genetics)
5. Organisms can never become extinct.
6. The environment had something to do with whyorganisms changed.
7. Parents are able to pass on at least some of their traits to their offspring.
8. Parents are only able to pass on traits that they were born with.
9. Organisms could decide to change something about their body and pass on that change to their offspring.
10. Organisms are still changing.
A B
C D
A
C
B
D
Lamarck (red cards) • 1st C• 2nd D• 3rd A• 4th B
Darwin (green cards)• 1st A• 2nd C• 3rd B• 4th D
Compared species and fossils he found along the islands with the species along the main coastline• Found similarities between the animals and
plants that had no relation to the species he previously studied in Europe but more resemblance to South American organisms
• Species found diversified and descended from the species off the mainland
Galápagos= saddle back• Each island has a distinct tortoise that has
made a home there
Variation is very evident when visiting island after island
At first Darwin thought he found different birds
But then recognized that they were subspecies that adapted to their food source, survived, reproduced and passed their adaptations on
Natural selection/Survival of the fittest
Was hesitant to publish book
Origin of Species• Famous book after he took his trip to the
Galápagos• Never used the world evolution but only
“descent with modification” due to the different environments organisms lived in
NATURAL SELECTION
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