Cette leçon contient 11 diapositives, avec quiz interactif, diapositives de texte et 2 vidéos.
La durée de la leçon est: 45 min
Éléments de cette leçon
Theory of Evolution
Slide 1 - Diapositive
What do you know about the theory of evolution already?
Slide 2 - Question ouverte
Slide 3 - Vidéo
Slide 4 - Vidéo
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 - Diapositive
Slide 6 - Diapositive
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 - Diapositive
askabiologist.asu.edu
Slide 8 - Lien
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
La durée de la leçon est: 45 min
