Finchstudentpresentation
- 1. Does Natural Selection act on Phenotypes or Genotypes? http://fig.cox.miami.edu/cmallery/150/unity/c1x17b-finches.jpg
- 2. The Grant Finch Study Peter and Rosemary Grant have studied and documented evolution of finch beaks on the Galapagos Islands. Changes in habitat and seed availability on the environmentally turbulent islands favored some finches and not others. Successive generations of the birds showed different beak shapes. Columbiajournalist.org.science_reporting/2005/article.asp?...lid=606
- 3. Individuals within a population vary in their traits: Fig Figure 1: Histogram of distribution of beak depth of medium ground finches on Daphne Major, before and after the drought of 1977 (Grant 1986). Reprinted by permission of Princeton University Press. http://fig.cox.miami.edu/cmallery/iso/unity/case_study.htm
- 4. Some variable traits are heritable; they are passed on to offspring: http://scied.fullerton.edu/biol409/session4/elaborate_b.html
- 5. More offspring are produced than can survive because of limited resources such as food and nesting sites: Figures 3a and 3b: Figure 3a shows the population of Geospiza fortis before and after the drought in 1977. Figure 3b demonstrates seed abundance on Daphne major before and after the drought. http://scied.fullerton.edu/biol409/session4/elaborate_b.html
- 6. Individuals with advantageous traits will survive and reproduce: Figure 1: Histogram of distribution of beak depth of medium ground finches on Daphne Major, before and after the drought of 1977 (Grant 1986). Reprinted by permission of Princeton University Press. http://fig.cox.miami.edu/cmallery/iso/unity/case_study.htm
- 7. Review Time! Natural selection acts on phenotypes rather than genotypes of an organism: it’s actions change the allele frequencies in a population. Variation within a species increases the likelihood that at least some members of a species will survive under changed environmental conditions.
- 8. The entire individual is the target of natural selection: The of the individual is NOT the target of selection Columbiajournalist.org.science_reporting/2005/article.asp?...lid=606
- 9. Which Figure or Figures Would Support These Statements? Individuals within a population vary in their traits Diversity of species increases the chance that at least some organisms of that species survive major changes in the environment
- 10. Internet Websites and Image Resources Columbiajournalist.org.science_reporting/2005/article.asp?...lid=606 http://fig.cox.miami.edu/cmallery/iso/unity/case_study.htm http://fig.cox.miami.edu/cmallery/150/unity/c1x17b-finches.jpg http://scied.fullerton.edu/biol409/session4/elaborate_b.html