Biological Evolution by Natural Selection Biology: Mr. McFadden 4-24-10 Write the Red
Population a localized group of individuals belonging to the same species Wildebeest
What is a species? Biological species concept (Mayr): a population or group of populations whose members have the ...
Biological EvolutionWhat is needed:1. Genetic Variation: Differences that occur in a population between individuals. ...
Variation in Phenotype Fig. 18-2a, p.285
Variation in Phenotype Fig. 18-2b, p.285
Variation in Phenotype Fig. 18-2c, p.285
Variation in Phenotype Fig. 18-2d, p.285
Variation in Phenotype Fig. 18-2e, p.285
Variation in Phenotype Variation can exist in: •Form, Shape, or Color •Speed, Intelligenc...
2. Heritability: Thisvariation can be passed tooffspring.
3. Fitness: some individuals are better able to survive and pass their genes to their offspring when they reproduce.
4. Natural Selection: Individuals that survive and reproduce (highest fitness) are those with the genes that are best ad...
Selective Pressures:o Environmental Change i. Temperature or Habitat Change ii. Earthquakes or Volcanoes
Selective Pressure Cont..Predation
Selective Pressure Cont..Limited Resources i. Food, Water, and/or Habitat
Review of Biological Evolution1. Variation2. Heritability3. Fitness4. Natural Selection
Review: Selective Pressures A pressure put on a species to survive such as an environmental change, predation, or limit...
Your Task Today Using your Notes and the Planet Earth Videos on Computers in the back, prepare a “mini-evolution” lesson ...
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Natural selection (2011)

Wednesday's Notes from Class...
Published on: Mar 3, 2016
Published in: Education      
Source: www.slideshare.net


Transcripts - Natural selection (2011)

  • 1. Biological Evolution by Natural Selection Biology: Mr. McFadden 4-24-10 Write the Red
  • 2. Population a localized group of individuals belonging to the same species Wildebeest
  • 3. 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)
  • 4. 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.
  • 5. Variation in Phenotype Fig. 18-2a, p.285
  • 6. Variation in Phenotype Fig. 18-2b, p.285
  • 7. Variation in Phenotype Fig. 18-2c, p.285
  • 8. Variation in Phenotype Fig. 18-2d, p.285
  • 9. Variation in Phenotype Fig. 18-2e, p.285
  • 10. Variation in Phenotype Variation can exist in: •Form, Shape, or Color •Speed, Intelligence, or Strength •Behavior or senses •Beak Size!!! •The possibilities are endless…
  • 11. 2. Heritability: Thisvariation can be passed tooffspring.
  • 12. 3. Fitness: some individuals are better able to survive and pass their genes to their offspring when they reproduce.
  • 13. 4. Natural Selection: Individuals that survive and reproduce (highest fitness) are those with the genes that are best adapted to their environment (adaptation).
  • 14. Selective Pressures:o Environmental Change i. Temperature or Habitat Change ii. Earthquakes or Volcanoes
  • 15. Selective Pressure Cont..Predation
  • 16. Selective Pressure Cont..Limited Resources i. Food, Water, and/or Habitat
  • 17. Review of Biological Evolution1. Variation2. Heritability3. Fitness4. Natural Selection
  • 18. 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
  • 19. 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