10.2 Darwin’s Observations

Points to Ponder

• Open your book to pg. 299

• Please read about Jean-Baptiste Lamarck and on pg. 4 of your notebook list three of his theories about Evolution

10.1 Early Ideas About Evolution

Jean-Baptiste Lamarck

• All organisms evolved toward perfection and complexity• He did not think that species became extinct- He thought

they evolved into different forms• Environmental change causes an organism’s

behavior to change, which leads to use or disuse of a structure– structure would become smaller or larger– would pass this trait on to offspring, leading to

change over time

10.2 Darwin’s Observations

FEMUR

PELVIS

Analyze this picture of a baleen whale. Using the ideas of Jean-Baptiste Lamarck (pg. 299) tell me why this whale has a pelvis and a femur.

PELVIS

FEMUR

Diacodexis(55 m.y.a.)

Pakicetus(52 m.y.a.)

Ambulocetus(50 m.y.a.)

Dorudon(40 m.y.a.)

Baleen Whale(Present day)

Diacodexis(55 m.y.a.)

Pakicetus(52 m.y.a.)

Ambulocetus(50 m.y.a.)

Dorudon(40 m.y.a.)

Baleen Whale(Present day)

Diacodexis(55 m.y.a.)

Pakicetus(52 m.y.a.)

Ambulocetus(50 m.y.a.)

Dorudon(40 m.y.a.)

Baleen Whale(Present day)

Diacodexis(55 m.y.a.)

Pakicetus(52 m.y.a.)

Ambulocetus(50 m.y.a.)

Dorudon(40 m.y.a.)

Baleen Whale(Present day)

Diacodexis(55 m.y.a.)

Pakicetus(52 m.y.a.)

Ambulocetus(50 m.y.a.)

Dorudon(40 m.y.a.)

Baleen Whale(Present day)

Set up Cornell Notes on pg. 5

•Topic: 10.2 Darwin’s Observations

•Essential Question:

1.(p.4) Make a double-bubble map comparing and contrasting variation and adaptation (give examples of each)

2.1 Atoms, Ions, and Molecules10.2 Darwin’s Observations

1. (p.4) Make a double-bubble map comparing and contrasting variation and adaptation (give examples of each)

10.2 Darwin’s Observations

KEY CONCEPT Darwin’s voyage provided insight on evolution.

10.2 Darwin’s Observations

Meet Charles Darwin

• Educated in Natural History

• Hired on the HMS Beagle as the ship’s naturalist

• He collected many organisms

• He formulated the idea that each species had developed from ancestors with similar features

10.2 Darwin’s Observations

The Voyage of the Beagle• In 1831 The HMS Beagle set sail • The voyage took 5 years• He read Lyell’s Principles of Geology• Darwin spent most of his time on shore observing species,

where he found much evidence supporting Lyell’s views

10.2 Darwin’s Observations

Variation- is the difference in the physical traits of an individual from those of other individuals in the group to which it belongs

Darwin noticed the variation of traits among similar species that he observed in his travels…

10.2 Darwin’s Observations

Interspecific variation

Variation among different species

Intraspecific variation

Variation among the same species

10.2 Darwin’s Observations

10.2 Darwin’s Observations

10.2 Darwin’s Observations

During Darwin’s journey he noticed that the differences among the species seemed well suited to the animals’ environment and diet

Discuss giraffes.

These observations led Darwin to realize that species may somehow be able to adapt to their surroundings

10.2 Darwin’s Observations

• An adaptation is a feature that allows an organism to better survive in its environment.

– Species are able to adapt to their environment.

– Adaptations can lead to genetic change in a population.

10.2 Darwin’s Observations

What adaptations do these animals have? Why do they need those adaptations?

Camel Cheetah

Giraffe

Mountain Goat

10.2 Darwin’s Observations

Please come up with your own animal and adaptation

• What is the name of the animal?• What is its adaptation?• Why does it need that/those adaptation(s)?

– food?– camouflage?

10.2 Darwin’s Observations

Compare these two tortoises. Note their looks and think about what type of food they would be able to eat.

10.2 Darwin’s Observations

Darwin observed differences among island species.

– Domed tortoises live in wet areas rich in mosses and short plants

– have shorter necks and legs

– Saddle-back tortoises that live in areas with tall plants

– have long necks and legs

10.2 Darwin’s Observations

• Darwin found fossils of extinct animals that resemble modern animals.

GlyptodonArmadillo

Darwin observed fossil and geologic evidence supporting an ancient Earth.

10.2 Darwin’s Observations

• He saw land move from underwater to above sea level

• Supported the theory that small daily geologic activity can lead to great changes over time

• Darwin extended his observations to the evolution of organisms.

Darwin observed an Earthquake

• Darwin found fossil shells high up in the Andes mountains.

• Variation vs. Adaptation Poster• Please create a "Variation vs. Adaptation" Poster

1. Split your poster into four squaresBox #1: Interspecific variationBox #2: Intraspecific variationBox #3: Animal Adaptation #1Box #4: Animal Adaptation #22. In each box draw a picture that demonstrates either the type of variation or animal adaptation.3. Explain each picture and how it relates to either variation or adaptation: what are their specialized adaptations, what are they used for?

Edmodo Directions (Comic Life/Pages/Keynote) PDF!!!!!:1. Find two examples that demonstrate variation (2 interspecific, 2 intraspecific)2. Explain what variation is, and the two types3. Find four examples of animals with specialized adaptations 4. Explain each animal and what their adaptations are, and what they are used for

Grizzly Bear Polar Bear

Killer Whale Blue Whale

vs.

vs.

Interspecific variation: is variation among individuals of different species

Interspecific Variation