This period.
- BS 5.4 en 5.5 Evolution

so 5.1 to 5.3 and 5.7
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Slide 1: Slide
BiologieMiddelbare schoolvwoLeerjaar 1

This lesson contains 28 slides, with interactive quizzes, text slides and 3 videos.

time-iconLesson duration is: 30 min

Items in this lesson

This period.
- BS 5.4 en 5.5 Evolution

so 5.1 to 5.3 and 5.7

Slide 1 - Slide

Unit 5 BS 4 the theory of evolution

Slide 2 - Slide

Individual organisms can evolve during a single lifespan

Slide 3 - Slide

 Evolutionary change is based on changes in the genetic makeup of populations over time. Populations, not individual organisms, evolve.

Slide 4 - Slide

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

Slide 5 - 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 6 - Slide

Slide 7 - Video

genetic variation

Slide 8 - Slide


Slide 9 - Slide

natural selection

Slide 10 - Slide

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

Slide 11 - Quiz

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

Slide 12 - 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 13 - Slide

Slide 14 - Slide

Sexual selection: female choice

Slide 15 - Slide

Arguments for the existence of evolution

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

Slide 16 - Slide

Also show that animals and plants have changed over time

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

Slide 17 - Slide

Slide 18 - 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 19 - Slide

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

Slide 20 - Slide

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

Slide 21 - Slide

Slide 22 - Video

homolog organs
analog organs

Slide 23 - Slide

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

Slide 24 - Quiz

Slide 25 - Video

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

Slide 26 - Open question

Slide 27 - Link

off to work 

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

Slide 28 - Slide