5.4: the theory of evolution

• Biologie
• Middelbare school
• havo, vwo
• Leerjaar 2

B4 The theory of evolution

• Put your things on your desk
•  Laptop, pencil case

• Start by reading: Lesson material of basic 5.4. Pages 125-128

Lessongoals

• You can describe the theory of evolotion
• You can list and explain the 3 main 'parts' of evolution
• You can name  examples  in support of the theory of evolution

Evolution has to do with ..

Evolution is about...

• The emergence of new species (all organisms)
• The way in which these species arise
• Determining which species are related to each other

Evolution is NOT about ..

• How life came to be
• How the universe/solar system/earth/etc. came to be
• If God exist

3 main mechanisms

Evolution can be summarized  into these 3 mechanisms:

1. Variation in genotypes
2. Natural selection
3. New species arise

Variation in genotypes

• Sexual reproduction > new/different genotypes
• New genotypes > new/differnet phenotypes
• Lot's of changes in genotype >    DNA changes 'too' much > new species

Natural selection

• Species who have adapted to 

        their environment will survive

        and reproduce

• 'Good' genes are  passed  on
• 'Bad' genes dissapear

New species arise

Animals of same species are  split up

The environment slowly changes.

Because of natural selection, other genes are 'good' in new environment

Species have become different species after many years of evolution, due to living apart

more examples

New species arise

• New species arise due to LONG periods of evolution in a species
• Many small changes together  become big changes

• Evolution takes very long! (thousands of years)

What is the deciding 'thing' that tells you that two organisms belong to the same species?

What you should do:

• Read lesson material 5.4
• Do asgmt 1-3, 5,6,7
• Challenge yourself: 8, 9

Done with the above?

• Learn for the test 
• Make other homework
• Read a book

Working with whispering

• Teacher is available for questions
• Only whisper with the student next to you
• Stay at your  desk