Natural Selection
Published on Feb 24, 2022
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PRESENTATION OUTLINE
Natural Selection
The process through which populations of living organisms adapt and change.
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Basic Ideas: Acts on an organisms physical characteristics
Can be classified by traits, genetic diversity and life cycle stage.
Photo by Julián Santacruz
Deeper Ideas: Most characteristics inherited ,
More offspring are produced than are able to survive
Offspring with favorable characteristics will survive and have more offspring than those individuals with less favorable traits.
Photo by Helena Lopes
Example: A population of mice has moved into a new area where the rocks are very dark, Due to natural genetic variation, some mice are black, while others are tan. Tan mice are more visible to predatory birds than black mice, because black mice had a higher chance of leaving offspring than tan mice. The next generation contains a higher fraction of black mice than the previous generation.
Photo by Enokson
Example: A population of mice has moved into a new area where the rocks are very dark, Due to natural genetic variation, some mice are black, while others are tan. Tan mice are more visible to predatory birds than black mice, because black mice had a higher chance of leaving offspring than tan mice. The next generation contains a higher fraction of black mice than the previous generation.
Photo by Enokson
Background Information: English naturalist Charles Darwin developed the idea of natural selection after a five-year voyage to study plants, animals, and fossils in south america and an islands in the pacific.
Photo by arbyreed
Why we study it: To gain a better understanding of evolutionary changes that occur over millions of years.
Photo by tjswinno | http://timswinson.com
Memory trick: You can find anything that reproduces with variation.
Photo by haynie.thomas36
