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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