Evolution

This period.
- BS 5.4 en 5.5 Evolution
- BS 6.1 to 6.7 Ecology and sustainability
- PO Ecological footprint
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Slide 1: Slide
BiologieMiddelbare schoolvwoLeerjaar 1

This lesson contains 24 slides, with interactive quizzes, text slides and 2 videos.

time-iconLesson duration is: 30 min

Items in this lesson

This period.
- BS 5.4 en 5.5 Evolution
- BS 6.1 to 6.7 Ecology and sustainability
- PO Ecological footprint

Slide 1 - Slide

Unit 5 BS 4 the theory of evolution

Slide 2 - Slide

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

Slide 3 - Slide

Charles Darwin (1809-1882)
Neodarwinistic evolution theory =

The process by which hereditary traits within a population of organisms change over the generations as a result of genetic variation, reproduction and natural selection.

Slide 4 - Slide

Slide 5 - Video

genetic variation

Slide 6 - Slide

reproduction

Slide 7 - Slide

natural selection

Slide 8 - Slide

What is natural selection?
A
organisms can change during their life
B
more organisms are born than there is room or food for.
C
predators only eat yellow colored insects
D
the organisms that are best adapted survive

Slide 9 - Quiz

Natural selection
Individuals that are best at surviving in their environment will produce more offspring 

Slide 10 - Slide

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 

Slide 11 - Slide

Sexual selection: female choice

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Arguments for the existence of evolution

- Fossils
- Vestigial organs
- DNA 
- Analog and homolog organs 


Slide 13 - Slide

Fossils
Also show that animals and plants have changed over time

The organism is quickly covered with a layer of sand or mud

Slide 14 - Slide

Slide 15 - Slide

Skeletons can tell us about the past
-Skeletons change over time
-how bones are shaped can tell us something about the past

Vestigial organs: 
Organs that an animal has but doesn't use anymore

Slide 16 - Slide

Example:  Tail bone 
Example:
Pelvis/Femur in whale 
Vestigial organ with no function:

Slide 17 - Slide

Leg bones in snakes -> Tickle females during mating
Vestigial organ with new function
Vestigial organs show that animals have changed over time

Slide 18 - Slide

Slide 19 - Video

homolog organs
analog organs

Slide 20 - Slide

Why are there not so many early fossils?
A
Early forms of life were soft bodied organisms
B
No animals were living a long time ago
C
Bones of those animals were never found
D
What are fossils again?

Slide 21 - Quiz

Fossils and vestigial organs show us that organisms changed over time. What is the theory called that explains what makes animals change?

Slide 22 - Open question

Slide 23 - Link

Assignment
  • Go to biology for you  and answer the questions 1 to 7
  • BS 5.4 

Slide 24 - Slide