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Natural Selection And Evolution


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Natural Selection And Evolution

  1. 1. Take a look at the following pictures.. What do you notice? What are some similarities? What are some differences?
  2. 12. What did you find? <ul><li>Similarities? </li></ul><ul><li>Differences? </li></ul>
  3. 13. Canis Familiaris <ul><li>Each picture we saw was a different type of dog </li></ul><ul><li>Dogs all belong to the same genus and species: Canis Familiaris </li></ul><ul><li>How did these varieties originate? </li></ul>
  4. 14. Canis familiaris <ul><li>Selective breeding by humans! </li></ul><ul><li>Take a look at the following pictures and tell me what you notice. </li></ul>
  5. 20. What did we learn? <ul><li>What was different about the second set of pictures from the first set? </li></ul>
  6. 21. Change over Time <ul><li>Observations of change in domesticated animals and plants helped people recognize that species can change over time </li></ul><ul><li>Charles Darwin gathered a lot of evidence and was the first person to publish his findings on the subject. </li></ul>
  7. 22. The Theory of Evolution <ul><li>First proposed by Lucretius. 1800 years before Darwin! </li></ul><ul><li>Darwin (English Scientist) was the first person to describe the mechanism in which evolution works </li></ul><ul><li>That process is known as Natural Selection </li></ul>
  8. 23. Charles Darwin
  9. 24. Darwin’s Voyage <ul><li>Darwin before publishing his book titled: On the Origin of Species traveled on the ship the HMS Beagle. </li></ul><ul><li>While traveling, he studied all kinds of plants and fossils </li></ul><ul><li>He visited the Galapagos Islands </li></ul>
  10. 25. Darwin’s Findings <ul><li>During his trip, Darwin discovered that many plants and animals on the galapagos islands resembled those of the nearby coast of South America. </li></ul><ul><li>He suggested that the birds migrated from the Galapagos Islands (near Ecuador) to South America </li></ul><ul><li>He noticed that the birds had undergone a change since they have been seperated and called this change “descent with modification” </li></ul>
  11. 26. Evolution by Natural Selection <ul><li>Darwin was influenced by a guy named Thomas Malthus, who said that populations are able to increase faster than food supply </li></ul><ul><li>Darwin realized this theory applies to all species </li></ul><ul><li>Every organism has the potential to produce many offspring during it’s lifetime. In most cases only a limited number survive to reproduce </li></ul>
  12. 27. Evolution by Natural Selection <ul><li>Darwin took it one step further to come up with the the idea of Natural Selection </li></ul><ul><ul><li>Natural Selection : Individuals that have physical or behavioral traits that better suit their environment are more likely to survive and will reproduce more successfully than those who do not have such traits </li></ul></ul>
  13. 28. Evolution by Natural Selection <ul><li>In time, the number of individuals that carry favorable characteristics that are also inherited will increase in population. </li></ul><ul><li>And thus the nature of the population will change- a process called evolution </li></ul>