Your SlideShare is downloading. ×
Finchstudentpresentation
Finchstudentpresentation
Finchstudentpresentation
Finchstudentpresentation
Finchstudentpresentation
Finchstudentpresentation
Finchstudentpresentation
Finchstudentpresentation
Finchstudentpresentation
Finchstudentpresentation
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Finchstudentpresentation

311

Published on

Published in: Travel, Education
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
311
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
3
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 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

×