Evolutionary Theories

Theories of Evolution

ACQUIRED

ORIGINALSTRETCHING

STRETCHINGLONGER NECK TO EAT FROM THE TALLER TREES

AND this got passed to children!

Let’s think about this…

Where do you get your traits from?

MOM and DAD

So…..

If your Mom decided to get a giant tattoo of a clown on her back, does that mean you will have a giant clown tattoo?!!

If your Dad decides to become a body builder and goes to the gym for 10 hours a day, will he be able to pass his muscles onto you?!!

Your Mom’s hair is brown, but she dyed it blonde. Will she be able to pass her new hair color on to you?!!

Your Dad is a smoker and acquires lung cancer from smoking cigarettes for many years. Does that mean he can pass his lung cancer on to you?!!!

These are all ENVIRONMENTAL changes! You cannot pass down your environmental choices, only your GENETIC code!

NO!!!!

NO!!!!

NO!!!!

NO!!!!

So if Lamarck’s theory wasn’t so great…

NATURAL SELECTION

VARIATION

HERITABLE VARIATON

MORECOMPETE

SURVIVE

COMPETITION

FIT

TRAITS

PASS ON

NATURAL SELECTION

If the environment is SNOWY and COLD…

White Fur

Makes it EASIER to hide from predators

Makes it EASIER to sneak up to catch prey

Brown Fur

Makes it HARDER to hide from predators

Makes it HARDER to sneak up to catch prey

Those that are more successful….

Get more FOOD

Which makes them STRONGER

Which attracts more FEMALES

Which means more BABIES with THEIR GENES

Future generations look more like the most “fit” organism

FITTEST

NATURE SELECTED

Important Vocabulary…

EVOLUTIONMATE FERTILE

VARIATION

ADAPTATION

How would Darwin explain the Giraffes…?VARIATION Most with SHORTER necks

Occasionally some with LONGER necks

COMPETITIONLONGER neck = easier time getting food

Food = survival

LONG NECK = BETTER TRAIT

NATURAL SELECTION

LONG Neck giraffes more successful in obtaining food and mates

LONG neck gene is passed on because it is the more successful trait

Future generations look more and more like the successful traits – LONG NECK giraffes

Practice EOC Question

Select 1 of the following activities:Activity 1:

Pretend you are Charles Darwin. Write a letter to Lamarck explaining why your theory of evolution is the most logical. Be sure to include scientific evidence to support your claims. Your letter should be at least a page in length and free of errors. You may also use images to support your explanation.

Activity 2:

Select an adaptation of a plant or animal. Write a scenario explaining how the trait might have evolved according to Lamarck, then write a second scenario explaining the chosen adaptation using Darwin’s ideas. Use images to support your explanation. Your explanation must include all the key ideas of each theory. Must be one page in length and free of errors.

Activity 3:Using the textbook and your notes, answer the following questions from the book. Answers questions in complete sentences, unless it is multiple choice. You will lose points if you fail to do so! All responses must be in your own words!•Pg. 389: #11, 15, 16, 18, 19, 21, 25•Pg. 390: #28, 31, 34•Pg. 391: #1, 2, 9, 10