Pages 157-164
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| DARWIN'S OBSERVATIONS | Surprised by the variety of living things he saw on voyage
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| Observations | Observed lots of diversity of organisms on Galapagos Islands
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| Species | A group of similar organisms whose members can mate with one another and produce fertile offspring
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| SIMILARITIES AND DIFFERNCES | -Lots of Galap. organisms were similar to South Am. mainland organisms -Darwin thought Galap. animals and plants came from South Am. mainland
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| Similarities | Dar. noticed many differences w/ similar organisms as he traveled from each Galap. island
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| ADAPTATIONS | A trait that helps an organism survive and reproduce
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| Finch Beaks | Finches that eat:
Insects-Small and Needlike beaks to dig out insects
Seeds-Wide and Strong beaks to break the seeds
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| EVOLUTION | The gradual change in a species over time
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| Scientific Theory | A well-tested concept that explains a wide range of observations
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| Galapagos Evolution | -Darwin thought Galap. organisms gradually changed over many gener.
-Also believed that evolution occured on Galap. Islands
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| NATURAL SELECTION | The process by which individuals that are better adapted to their environment are more likely to survive and reproduce than other members of the same species
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| "The Origin of Species" | <-- Darwin's book explained that evolution occured because of natural selection
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| Survival of the Fittest | Individuals with variations become better adapted to enviro. will survive
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| Kinds of Natural Selection | OVERPRODUCTION- Species produce more offspring than can survive COMPETITION- Caused by limited food & other resources VARIATIONS- Differences between individuals of the same species
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| THE ROLES OF GENES IN EVOLUTION | Only traits that are controlled by genes can be acted upon by natural selection
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| Darwin's Knowledge | Darwin didn't know alot about genes and mutations
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| EVOLUTION IN ACTION | Evolution by natual selection can occur in as short of a time period as one year
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| Galapagos Islands Drought of 1977 | During drought, only Galap. finches with larger and stronger beaks were able to survive better
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| HOW DO NEW SPECIES FORM? | When a group of individuals remain separated from rest of species long enough to develop new traits
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| How Can a Group Be Separated From Its Species? | -Continental Drift -Get Lost -River, Volcano, Mountain Range (Phys. Feat.) -Ocean Wave
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| CONTINENTAL DRIFT | The very slow motion of the continents. (Pangea gradually split apart)
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| What Happened to Plant and Animal Species Durign Cont. Drift? | Species got separated from each other and evovled separately/independently
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Created by:
Avery R.
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