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EVIDENCE OF EVOLUTION. SB5c. Explain how fossil and biochemical evidence support the theory. What is Evolution?. Change in the genetic composition of a population over time . http://www.pbs.org/wgbh/evolution/educators/teachstuds/unit3.html.

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EVIDENCE OF EVOLUTION

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EVIDENCE OF EVOLUTION

SB5c. Explain how fossil and biochemical evidence support the theory


What is Evolution?

  • Change in the genetic composition of a population over time.


http://www.pbs.org/wgbh/evolution/educators/teachstuds/unit3.html

What evidence do scientists have that evolution has occurred?

1. Fossils

  • Found in sedimentary rock layers (strata)

  • Fossils found deeper very different from fossils found closer to surface

  • Fossils found deeper are older-relative dating

  • A fossil’s carbon14 can be measured to determine actual age- radiometric dating

  • Fossils have revealed changes in organisms over time and provide clues to changes in climate.


What evidence do we have that evolution has occurred?

2. Homology- Similarity in characteristics of different species resulting from common ancestor

a. Homologous structures- structures that may have different functions but have similar structure


What evidence do we have that evolution has occurred?

b. Vestigial structures- structures that are reduced & have no function.


What evidence do we have that evolution has occurred?

c. Molecular homology- similar DNA sequences indicate close relationships


What evidence do we have that evolution has occurred?

d. Embryological evidence- embryo development similar, may indicate close relationship


What evidence do we have that evolution has occurred?

  • Biogeography

    • Geographic distribution of species

    • Island species are similar to mainland species

    • EX: Darwin’s finches are similar to birds on South Americam Continent.


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