EVOLUTION, DARWIN Natural Selection S.W.B.A.T.: Determine that what Darwin viewed in nature about...

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EVOLUTION, DARWIN Natural Selection S.W.B.A.T.: Determine that what Darwin viewed in nature about the traits of living things helps organisms even today survive and adapt to their surroundings.

Transcript of EVOLUTION, DARWIN Natural Selection S.W.B.A.T.: Determine that what Darwin viewed in nature about...

Page 1: EVOLUTION, DARWIN Natural Selection S.W.B.A.T.: Determine that what Darwin viewed in nature about the traits of living things helps organisms even today.

EVOLUTION, DARWINNatural Selection

S.W.B.A.T.: Determine that what Darwin viewed in nature about the traits of living things helps organisms even today survive and adapt to their

surroundings.

Page 2: EVOLUTION, DARWIN Natural Selection S.W.B.A.T.: Determine that what Darwin viewed in nature about the traits of living things helps organisms even today.
Page 3: EVOLUTION, DARWIN Natural Selection S.W.B.A.T.: Determine that what Darwin viewed in nature about the traits of living things helps organisms even today.

What Did Darwin’s Travels Reveal

• The diversity of living species was far greater than anyone had previously known

• These observations led him to develop the Theory of Evolution

Page 4: EVOLUTION, DARWIN Natural Selection S.W.B.A.T.: Determine that what Darwin viewed in nature about the traits of living things helps organisms even today.

How did tortoises and birds differ among the islands of the

Galapagos?

• Each island

had its own type

of tortoises

and birds that

were clearly

different from

other islands

Page 6: EVOLUTION, DARWIN Natural Selection S.W.B.A.T.: Determine that what Darwin viewed in nature about the traits of living things helps organisms even today.
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Natural Selection

• The traits that help an organism survive in a particular environment are “selected” in natural selection

Page 8: EVOLUTION, DARWIN Natural Selection S.W.B.A.T.: Determine that what Darwin viewed in nature about the traits of living things helps organisms even today.
Page 9: EVOLUTION, DARWIN Natural Selection S.W.B.A.T.: Determine that what Darwin viewed in nature about the traits of living things helps organisms even today.
Page 10: EVOLUTION, DARWIN Natural Selection S.W.B.A.T.: Determine that what Darwin viewed in nature about the traits of living things helps organisms even today.
Page 11: EVOLUTION, DARWIN Natural Selection S.W.B.A.T.: Determine that what Darwin viewed in nature about the traits of living things helps organisms even today.

Evolution is when organisms change over time

So, modern organisms descended from ancient ones

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Evidence of EvolutionReview

• Fossil Record provides evidence that living things have evolved

• Fossils show the history of life on earth and how different groups of organisms have changed over time

Page 13: EVOLUTION, DARWIN Natural Selection S.W.B.A.T.: Determine that what Darwin viewed in nature about the traits of living things helps organisms even today.

Primate Fossils

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Primate Bone Structure

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Primate Brain Capacity

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Vestigial OrgansEvidence of Evolution

• Organ that serves no useful function

• Present day organisms evolved from ancestors in which these organs were useful

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Biochemical Evidence• All living organisms are made of the same

20 common amino acids

• All living organisms have DNA as the code of life with the same 4 bases: adenine, thymine, cytosine, guanine

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Homologous StructureEvidence of Evolution

• Body parts that are similar in structure in different organisms and seem to have developed from the zygote the same way

• Homologs may have different uses in different species

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Similar EmbryosEvidence of Evolution

• In their early stages of development, chickens, turtles and rats look similar, providing evidence that they shared a common ancestry.