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