Evolutionary thinking/ forms of speciation


Lesson 2: evolutionary thinking
1 / 20
Slide 1: Tekstslide
BiologieMiddelbare schoolvwoLeerjaar 4

In deze les zitten 20 slides, met interactieve quizzen en tekstslides.

Onderdelen in deze les


Lesson 2: evolutionary thinking

Slide 1 - Tekstslide

In a certain population, disruptive selection is occurring. In this population, which is most likely to survive?
organisms with average traits
organisms with extreme traits
organisms that sexually select
organisms that are small

Slide 2 - Quizvraag

Effect natural selection on phenotype distribution

Slide 3 - Tekstslide

Cheetahs nearly became extinct but recovery efforts managed to save them. Now, most cheetahs are genetically identical. This is due to:
gene flow
the bottleneck effect
selective migration
random mating

Slide 4 - Quizvraag

Members of different species do not normally produce offspring due to:
differing courtship rituals
varying breeding times
gamete incompatibility
all of these

Slide 5 - Quizvraag

Who is afraid of snakes (or spiders) and why?

Slide 6 - Woordweb

Slide 7 - Tekstslide

Slide 8 - Tekstslide

Slide 9 - Tekstslide

Slide 10 - Tekstslide

Slide 11 - Tekstslide

Slide 12 - Tekstslide

Five processes that lead to evolution
  1. Small population/genetic drift: chance will start to play a role
  2. Non-random mating/sexual selection
  3. Mutation
  4. Gene flow: immigration and emigration 
  5. Natural selection 

Slide 13 - Tekstslide

Properly describing natural selection
  1. There is genetic variation in the population caused by mutations
  2. Some individuals have a higher chance of survival due to an advantage/adaptation(describe the advantage)
  3. The better adapted individuals will reproduce more (higher fitness) 
  4. The genes of the better adapted individuals will therefore become more common in the population

Slide 14 - Tekstslide

1. part of a population becomes separated from the rest of the species.
2. adaptation to different environmental conditions.
3. reproductive isolation. As long as the two groups interbreed they share the same gene pool and remain the same species.

Slide 15 - Tekstslide

Forms of speciation
Allopatric speciation: reproductive isolation is caused by a geographical barrier

Sympatric speciation: there is no geographical barrier, but something else stopping them from reproducing, for example temporal, behavioral or habitat isolation

Slide 16 - Tekstslide

Slide 17 - Tekstslide

Slide 18 - Link

Slide 19 - Tekstslide

Fill out the lesson feedback form
Finish the worksheet on mating flies.
Go through the LessonUp for next lesson.

Slide 20 - Tekstslide