5.4 The theory of evolution
Lesduur is: 30 minOnderdelen in deze les
Who is this?
Charles Darwin
A nineteenth-century English scientist
Developer of the theory of evolution
Who is this?
Learning objective:
You can describe the theory of evolution
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
Video assignment. Write the questions in your notebook
What causes variation in a species?
What is the advantage of variation?
How do new species arise?
Variation in genotypes
Caused by:
- Sexual reproduction
- Mutations
Variation in genotypes caused by mutations and sexual reproduction
Let's work a bit
Answer question 1 p. 130
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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?
The red fox
The white fox
Explain how the giraffe has a long neck through natural selection
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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?
If there is no variation in genotype and phenotype
If there is variation in genotype and phenotype
Changes in the environment
The species is changing, but remains a single species
Obstacle between two groups (isolation) causes new species
Divergence , adapation , new species arises
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.
Let's work
Unit 5.4 the theory of evolution
Question 2, 3, 5, 7 en 8