Dichotomous Keys, Variation, Natural Selection
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Created by:
misswatson Plus on May 17, 2011
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29 terms
Terms | Definitions |
|---|---|
 Dichotomous Key | a grouping tool that scientists use to classify animals or plants based on observations |
| "dichotomous" means | ... "to cut in two" or "divide in two." |
| Variation | any differences between individuals of the same species. |
| Species | a group of similar organisms that mate with each other in their natural setting and produce fertile offspring. |
| Alleles | Variation is caused by differences in __________. |
| Survival | Variation increases the chances of ___________. |
| Hibernation | A state of greatly reduced body activity that occurs during the winter. |
| Migration | The regular, periodic journey of an animal from one place to another and back again for the purpose of feeding or reproducing. |
| Tropism | the growth of plants in response to stimuli, which are things that an organism responds to. |
| Gravity | Geotropism is the response of plants to... |
| Light | Phototropism is the response of plants to... |
| Behavior | Variation can be caused by ____ such as migration, geotropism, etc. |
| External Features | Variation can be caused by ___ such as appendages, mouth structures, etc. |
| Charles Darwin | Naturalist who come up with the process of Natural Selection to explain how organisms evolved. |
| Natural world | A naturalist is one who studies the ________. |
| HMS Beagle | Darwin sailed on the ship ___. |
| Galapagos Islands | One of the places where Darwin saw incredible diversity. |
| Tortoises and finches | Two animals that Darwin studied a lot on the Galapagos Islands. |
| Evolution | the gradual change in a species over time. |
| How | Darwin wanted to know ___ species evolved. |
| Natural Selection | the process by which individuals that are better adapted to their environment are more likely to survive and reproduce. |
| Overproduction, Competition, Variations, Selection | Factors that affect the process of natural selection. |
| Long | Over a ___ period of time, natural selection can cause organisms to evolve. |
| Selective breeding | the process of selecting a few organisms with desired traits to serve as parents of the next generation |
| Pigeons | Darwin used selective breeding on _____. |
| Overproduction | Most species produce more offspring than can possibly survive |
| Compete | Since food and other resources are limited organism often indirectly ___ for them |
| Features and Behaviors | Variations are caused by ____, |
| Selection | when some variations make an individual better adapted to survive and reproduce and pass on their alleles. |
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