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Natural Selection Charles Darwin’s Big Ideas!

Natural Selection Charles Darwin’s Big Ideas!. Principles of Natural Selection There is variation within populations (i.e.; not all penguins or dandelions

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Page 1: Natural Selection Charles Darwin’s Big Ideas!. Principles of Natural Selection  There is variation within populations (i.e.; not all penguins or dandelions

Natural Selection

Charles Darwin’s Big Ideas!

Page 2: Natural Selection Charles Darwin’s Big Ideas!. Principles of Natural Selection  There is variation within populations (i.e.; not all penguins or dandelions

Principles of Natural Selection

Principles of Natural Selection

There is variation within populations (i.e.; not all penguins or dandelions are alike)

Variation is a result of sexual reproduction and mutations in genes

More offspring are produced than can liveThere is competition for limited resourcesOrganisms with the best traits

(adaptations) survive and pass on their genes to their offspring

There is variation within populations (i.e.; not all penguins or dandelions are alike)

Variation is a result of sexual reproduction and mutations in genes

More offspring are produced than can liveThere is competition for limited resourcesOrganisms with the best traits

(adaptations) survive and pass on their genes to their offspring

Page 3: Natural Selection Charles Darwin’s Big Ideas!. Principles of Natural Selection  There is variation within populations (i.e.; not all penguins or dandelions

Polar Bear ParagraphPolar Bear Paragraph

Polar Bears, with their thick layer of fur and fat, are well adapted to cold climates. In terms of evolution and natural selection, how did these changes in the polar bear occur over time?

Polar Bears, with their thick layer of fur and fat, are well adapted to cold climates. In terms of evolution and natural selection, how did these changes in the polar bear occur over time?

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Page 4: Natural Selection Charles Darwin’s Big Ideas!. Principles of Natural Selection  There is variation within populations (i.e.; not all penguins or dandelions

Polar Bear Paragraph Answer

Polar Bear Paragraph Answer

There is variation among polar bears. Not all polar bears are the same due to genetic differences. Some polar bears are better adapted (just by luck!) to their environment. More polar bears are produced than can survive. There is competition for limited resources. Those polar bears with the best traits, survive and pass on their genes for thick fur and fat to their offspring.

There is variation among polar bears. Not all polar bears are the same due to genetic differences. Some polar bears are better adapted (just by luck!) to their environment. More polar bears are produced than can survive. There is competition for limited resources. Those polar bears with the best traits, survive and pass on their genes for thick fur and fat to their offspring.

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Page 5: Natural Selection Charles Darwin’s Big Ideas!. Principles of Natural Selection  There is variation within populations (i.e.; not all penguins or dandelions

Cave Salamander Paragraph

Cave Salamander Paragraph

Cave Salamanders are blind (they have eyes which are not functional). How would a biologist explain how blind cave salamanders evolved from sighted salamander ancestors?

Cave Salamanders are blind (they have eyes which are not functional). How would a biologist explain how blind cave salamanders evolved from sighted salamander ancestors?

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Page 6: Natural Selection Charles Darwin’s Big Ideas!. Principles of Natural Selection  There is variation within populations (i.e.; not all penguins or dandelions

Cave Salamander AnswerCave Salamander AnswerThere is variation among cave

salamanders. Not all cave salamanders are the same due to genetic differences. Some cave salamanders are better adapted (just by luck!) to their environment. More salamanders are produced than can survive. There is competition for limited resources. Blind cave salamanders are able to smell food more easily. Those cave salamanders with the best trait(s) survived and passed on the gene for being blind to their offspring.

There is variation among cave salamanders. Not all cave salamanders are the same due to genetic differences. Some cave salamanders are better adapted (just by luck!) to their environment. More salamanders are produced than can survive. There is competition for limited resources. Blind cave salamanders are able to smell food more easily. Those cave salamanders with the best trait(s) survived and passed on the gene for being blind to their offspring.

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