Lamark vs Darwin

Lamark vs Darwin

Evolution

Lamarks Theory

• Inheritance of acquired characteristics

• Organism will acquire traits that are needed over its life

• EX: a giraffe can get a longer neck simply by stretching daily.

Lamark's Theory

• Giraffes all had SHORT necks originally

• Giraffe’s Necks got LONGER from stretching for food

• “Acquired” trait (long necks) then passed to offspring

• Giraffe population became long-necked

Open Ended

What is wrong with Lamark's theory?

Lamark's Theory

• Acquired characteristics are heritable

• EX: If you crop a dogs ears, all their offspring will be born with cropped ears.

• Ex: If you get a tattoo, all you children will be born with that same tattoo

Multiple Choice

Will puppies born look like the dog on the right or the left?

• The puppies will all be born with floppy ears

• The puppies will all be born with cropped ears

Darwin's Theory

• Survival of the fittest

• Those animals with the best adaptations/characteristics survive and reproduce, passing on their superior genetics.

• EX: Giraffes with short necks starved to death while longer necked giraffes survived and passed on their long necked trait.