BS 4 - The theory of evolution

Theory of Evolution
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Slide 1: Slide
BiologieMiddelbare schoolhavoLeerjaar 3

This lesson contains 11 slides, with interactive quiz, text slides and 2 videos.

time-iconLesson duration is: 45 min

Items in this lesson

Theory of Evolution

Slide 1 - Slide

What do you know about the theory of evolution already?

Slide 2 - Open question

Slide 3 - Video

Slide 4 - Video

Natural selection
  • The process through which populations of living organisms adapt and change.
  • Not all individuals have an equal chance of survival
  • Healthy and strong individuals have the greatest chance of staying alive and having offspring
  • Ex. giraffe

Slide 5 - Slide

Slide 6 - Slide

Peppered moths
  • Prior to 1800 these moths had a light pattern, dark pattern was very uncommon - collectors item
  • During the industrial revolution (1820-1840), soot darkened tree trunks and killed off lichen
  • Light moths eventually became rare and the dark moths multiplied quickly. Why/How?

Slide 7 - Slide

Slide 8 - Link

Speciation - How new species arise
Two ways of formation
1.  Variation within a species
      a. Variation - different genotypes and phenotypes
      b. Species can then respond to environmental variation
2. Isolation
     a. When one species becomes separated and isolated from each other
     b. example: river, mountains, ice, desert or a sea
     c. Over time organisms become more different and can no longer             reproduce

Slide 9 - Slide

Slide 10 - Slide

Slide 11 - Link