(Macroevolution)

(1)

Developed the theory of evolution by observing animals on the Galapagos Islands

Wrote a book Origin of Species to describe his theory

(2)

The environment plays a role in which animals can survive and which may die

Ex. In the Arctic only dogs with long, thick fur will survive.

(3)

Which dog should live in

each environment?

Darwin’s Finches

http://www.brainpop.com/science/

ecologyandbehavior/naturalselection/

Every once in a while there are changes in DNA bases – mutations

Mutations can cause misreading of DNA

(4)

Statistical Chances of a Mutation Occurring to One

Nucleotide is 1/109

Mutations cause mostly bad disorders, but every once in a while there may be a non-harmful mutation

Always remember that mutations are random events!

A trait (caused by a mutation) that allows an organism to have a better chance of survival

(5)

Adaptations are a result of “beneficial”

mutations, these mutations cause

changes in organisms and allow

them to survive.

All organisms have a mix of genes. Certain environments cause specific genes to be

chosen from pre-existing genetic

information.

Any animal that can not survive in the environment will go extinct.

(6)