Natural Selection Variation. Natural Selection Variation Heredity.
Natural selection (2011)
-
Upload
justinmcfadden -
Category
Education
-
view
312 -
download
1
description
Transcript of Natural selection (2011)
![Page 1: Natural selection (2011)](https://reader034.fdocuments.net/reader034/viewer/2022052508/559b415e1a28abed538b45fa/html5/thumbnails/1.jpg)
Biological Evolution by Natural Selection
Biology: Mr. McFadden
4-24-10Write the Red
![Page 2: Natural selection (2011)](https://reader034.fdocuments.net/reader034/viewer/2022052508/559b415e1a28abed538b45fa/html5/thumbnails/2.jpg)
Population a localized group of
individuals belonging to the same species
Wildebeest
![Page 3: Natural selection (2011)](https://reader034.fdocuments.net/reader034/viewer/2022052508/559b415e1a28abed538b45fa/html5/thumbnails/3.jpg)
What is a species? Biological species concept
(Mayr): a population or group of populations whose members have the potential to interbreed and produce viable, fertile offspring (genetic exchange is possible and that is genetically isolated from other populations)
![Page 4: Natural selection (2011)](https://reader034.fdocuments.net/reader034/viewer/2022052508/559b415e1a28abed538b45fa/html5/thumbnails/4.jpg)
Biological EvolutionWhat is needed:1. Genetic Variation: Differences that occur
in a population between individuals.3 Sources of Variation:
Mutations are changes in the DNA. A single mutation can have a large effect, but in many cases, evolutionary change is based on the accumulation of many mutations.
Gene flow is any movement of genes from one population to another.
Sex can introduce new gene combinations into a population during meiosis & fertilization.
![Page 5: Natural selection (2011)](https://reader034.fdocuments.net/reader034/viewer/2022052508/559b415e1a28abed538b45fa/html5/thumbnails/5.jpg)
Fig. 18-2a, p.285
Variation in Phenotype
![Page 6: Natural selection (2011)](https://reader034.fdocuments.net/reader034/viewer/2022052508/559b415e1a28abed538b45fa/html5/thumbnails/6.jpg)
Fig. 18-2b, p.285
Variation in Phenotype
![Page 7: Natural selection (2011)](https://reader034.fdocuments.net/reader034/viewer/2022052508/559b415e1a28abed538b45fa/html5/thumbnails/7.jpg)
Fig. 18-2c, p.285
Variation in Phenotype
![Page 8: Natural selection (2011)](https://reader034.fdocuments.net/reader034/viewer/2022052508/559b415e1a28abed538b45fa/html5/thumbnails/8.jpg)
Fig. 18-2d, p.285
Variation in Phenotype
![Page 9: Natural selection (2011)](https://reader034.fdocuments.net/reader034/viewer/2022052508/559b415e1a28abed538b45fa/html5/thumbnails/9.jpg)
Fig. 18-2e, p.285
Variation in Phenotype
![Page 10: Natural selection (2011)](https://reader034.fdocuments.net/reader034/viewer/2022052508/559b415e1a28abed538b45fa/html5/thumbnails/10.jpg)
Variation can exist in:•Form, Shape, or Color•Speed, Intelligence, or Strength•Behavior or senses•Beak Size!!!•The possibilities are endless…
Variation in Phenotype
![Page 11: Natural selection (2011)](https://reader034.fdocuments.net/reader034/viewer/2022052508/559b415e1a28abed538b45fa/html5/thumbnails/11.jpg)
2. Heritability: This variation can be passed to offspring.
![Page 12: Natural selection (2011)](https://reader034.fdocuments.net/reader034/viewer/2022052508/559b415e1a28abed538b45fa/html5/thumbnails/12.jpg)
3. Fitness: some individuals are better able to survive and pass their genes to their offspring when they reproduce.
![Page 13: Natural selection (2011)](https://reader034.fdocuments.net/reader034/viewer/2022052508/559b415e1a28abed538b45fa/html5/thumbnails/13.jpg)
4. Natural Selection: Individuals that survive and reproduce (highest fitness) are those with the genes that are best adapted to their environment (adaptation).
![Page 14: Natural selection (2011)](https://reader034.fdocuments.net/reader034/viewer/2022052508/559b415e1a28abed538b45fa/html5/thumbnails/14.jpg)
Selective Pressures:o Environmental Change
i. Temperature or Habitat Changeii. Earthquakes or Volcanoes
![Page 15: Natural selection (2011)](https://reader034.fdocuments.net/reader034/viewer/2022052508/559b415e1a28abed538b45fa/html5/thumbnails/15.jpg)
Selective Pressure Cont..
Predation
![Page 16: Natural selection (2011)](https://reader034.fdocuments.net/reader034/viewer/2022052508/559b415e1a28abed538b45fa/html5/thumbnails/16.jpg)
Selective Pressure Cont..Limited Resources
i. Food, Water, and/or Habitat
![Page 17: Natural selection (2011)](https://reader034.fdocuments.net/reader034/viewer/2022052508/559b415e1a28abed538b45fa/html5/thumbnails/17.jpg)
Review of Biological Evolution
1. Variation2. Heritability3. Fitness4. Natural Selection
![Page 18: Natural selection (2011)](https://reader034.fdocuments.net/reader034/viewer/2022052508/559b415e1a28abed538b45fa/html5/thumbnails/18.jpg)
Review: Selective Pressures
A pressure put on a species to survive such as an environmental change, predation, or limiting resources.
Go to the following website to complete the Planet Earth Evolution “Mini Lesson”
http://dsc.discovery.com/convergence/planet-earth/video-player/video-player.html
![Page 19: Natural selection (2011)](https://reader034.fdocuments.net/reader034/viewer/2022052508/559b415e1a28abed538b45fa/html5/thumbnails/19.jpg)
Your Task Today
Using your Notes and the Planet Earth Videos on Computers in the back, prepare a “mini-evolution” lesson to present to the class TODAY, with your video.
19