The theory of evolution

• Biologie
• Middelbare school
• havo, vwo
• Leerjaar 3

Upcoming lessons

- BS 5.4 en 5.5 Evolution

- BS 6.1 to 6.3 Ecology

Unit 5 BS 4 the theory of evolution

What trait does this fawn (baby hertje) have that gives it better evolutionary odds?

Does this tiger have the same benefits?

What do you know already about the theory of evolution?

Evolution

The development of life on Earth, with species appearing and changing and/ or disappearing

Charles Darwin

A nineteenth-century English scientist

Developer of the theory of evolution

Video assignment. Write the questions in your notebook

1. What causes variation in a species?
2. What is the advantage of variation?
3. How do new species arise?  

Variation in genotypes

Sexual reproduction

Mutations

Variation in genotypes caused by mutations and sexual reproduction

Let's work a bit

Make question 1 p. 130

Natural selection

An organism can be well or poorly adapted to its environment → this determines its chance of survival.

Organisms with 'beneficial' traits for that environment:

Have (many) offspring

The beneficial traits are passed on.

In the polar region (snow), which organism has the greatest chance of survival and reproduction?






In the polar region (snow), which organism has the greatest chance of survival and reproduction?






In the polar region (snow), which organism has the greatest chance of survival and reproduction?




In the polar region (snow), which organism has the greatest chance of survival and reproduction?




In the polar region (snow), which
organism has the greatest chance of survival and reproduction?

1. The red fox
2. The white fox

Explain how the giraffe has a long neck through natural selection

Species

Organisms belong to the same species when they can reproduce with each other and produce fertile offspring.

When does a species have the greatest chance of survival?

1. If there is no variation in genotype and phenotype
2. If there is variation in genotype and phenotype

Changes in the environment

The species is changing

Obstacle between two groups (isolation)

Divergence , adapation , new species arises

complete the following sentences

1. Evolution occurs through n_______ s________
   
2. Individual organisms show v__________.
3. Many die by predation, disease and c_________
4. Individuals most suited to the environment survive to breed – ‘su______l of the fi_______t.
5. The genes that help the individual survive are passed on to the of_________g.

apply the evolution theory to explain..

why polar bears wear a white fur.

Evolution in Steps

1. More individuals will be born that can survive 'struggle for existence'
   
2. Individuals with an advantage have a higher chance of surviving ' natural selection' 
   
3. The individuals that survive will have a higher chance to produce offspring 
   

Sexual selection: female choice

Let's work

Unit 5.4 the theory of evolution

Question 2, 3, 5, 7 en 8