Natural Selection
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PRESENTATION OUTLINE
Natural Selection
Definition: When certain organisms in a species are best suited to their environment and survive and reproduce at a higher rate than other members of the species.
Photo by Arno Meintjes Wildlife
Steps of Natural Selection
Overproduction
Variation
Adaptation
Selection
Photo by Matthias Neugebauer
Overproduction
Definition: When too many organisms are produced and the amount exceeds the carrying capacity.
Example: When too many beetles are produced, some of them are eaten by predators.
Photo by Caramosca
Variation
Definition: When many offspring are produced, they have different genes. This causes for them to have different physical traits.
Example: Some finches have small beaks, others have large beaks.
Photo by Howard21042
Adaptation
Definition: When organisms have variations that give them an advantage over other organisms. These traits make them better adapted to survive.
Example: Nature caused some giraffe's necks to grow longer so they could easily access their food source.
Photo by digitalART2
Selection
Definition: When organisms who have special traits are better adapted to survive, so they reproduce and pass on their genes to the next generation.
Example: Non-toxic butterflies that mimic toxic butterflies' wings are selected to reproduce because they are not eaten by predators.
Photo by archer10 (Dennis) (66M Views)
Artificial Selection
Definition: When humans mimic natural selection by choosing which traits we want and which individuals in a species survive and reproduce.
Example: Over time, we have artificially selected which dogs survive by breeding them.
Photo by Salvador Nobre da Veiga
