General Announcements:
Evolution in Modern Times Webquest
Answers to Evidence of Evolution Packet
Answers to the Evolution and Diversity Packet
Changes Through Time Project: Due Wednesday 4/30. (Rough Draft due 4/27)
- See the directions on page 9 of your lab manual and the rubric for grading on page 10.
- Having trouble deciding what do draw? Use this website- slides 4, 5 and 6 to help.
- Sample Projects Click HERE
- For a copy of the requirements and rubric, click HERE
Quiz Tuesday 4/21
Topics:
Definitions of: Adaptation, Selecting Agent, Evolution, mutation
Toothpick Fish Lab
Darwin's Theory of Natural Selection.
Evolution Vocabulary
1. Evolution : A change in a species over time. Also referred to as the theory of natural selection. Modern theory of evolution states that this change in species over time is due to natural selection and variation that results from gene mutation and recombination.
2. Adaptation : An alteration or adjustment in structure or habits, often hereditary, by which a species or individual improves its condition in relationship to its environment.
3. Species : A category of classification consisting of related organisms capable of interbreeding.
4. Population : All the organisms that constitute a specific group or occur in a specified habitat or environment.
5. Darwin - "The father of evolution" Darwin's theory consists of multiple parts.
- 1. Overproduction. Within a population, more offspring are produced in each generation than can survive, because of the limitations of food supply and living space
- 2. Competition. The individuals of each generation compete for the available food and for opportunities to mate and reproduce.
- 3. Variation. Within each generation, some individuals are better fitted to survive than others, because of variations in characteristics.
- 4. Survival of the fittest. Those individuals better fitted to survive are more likely to live long enough to reproduce.
- 5. Transmission of favorable variations. The offspring of the fittest individuals will inherit the favorable variations that enabled their parents to survive and reproduce.
- 6. Evolution of the species. The accumulation of favorable variations (adaptations) in this way will gradually lead to the appearance of new species better adapted to their environment.
6. Natural Selection: The process in nature by which, according to Darwin's theory of evolution, only the organisms best adapted to their environment tend to survive and transmit their genetic characters in increasing numbers to succeeding generations while those less adapted tend to be eliminated and thus do not pass on their genes.
7. Variation: Marked difference or deviation from the normal or recognized form, function or structure. An organism or a plant exhibiting such difference or deviation.
8. Competition: The simultaneous demand by two or more organisms for limited environmental resources, such as nutrients, living space, or light.
9. Survival of the fittest: Natural selection conceived of as a struggle for life in which only those organisms best adapted to existing conditions are able to survive and reproduce.
10. Fossil: A remnant or trace of an organism of a past geologic age, such as a skeleton or leaf imprint, embedded and preserved in the earth's crust.
11. Extinction: The fact of being extinct or the process of becoming extinct: "The most effective agent in the extinction of species is the pressure of other species" (Alfred R. Wallace).
12. Sedimentary rocks: Rock layers that form in different geological time periods that can contain fossils. The oldest layers of rock tend to be at the bottom, whereas the newest rock tends to be near the surface. These types of rocks are useful in determining the age of a fossil.
15. Similar Structures: Similar in structure and evolutionary origin, though not necessarily in function, as the flippers of a seal and the hands of a human being.
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