Your SlideShare is downloading. ×
Theory of evolution notes
Theory of evolution notes
Theory of evolution notes
Theory of evolution notes
Theory of evolution notes
Theory of evolution notes
Theory of evolution notes
Theory of evolution notes
Theory of evolution notes
Theory of evolution notes
Theory of evolution notes
Theory of evolution notes
Theory of evolution notes
Theory of evolution notes
Theory of evolution notes
Theory of evolution notes
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

Theory of evolution notes

1,422

Published on

Published in: Technology, Education
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total Views
1,422
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
58
Comments
0
Likes
1
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. Theory of Evolution Natural Selection
  • 2. Genetic variation is the driving force behindevolution. There are many ideas of why populationschange overtime. These changes may be due tomutation, movement of alleles betweenpopulations, interbreeding, isolation, and naturalselection
  • 3. Theories of EvolutionA. Jean Baptist LamarckEvolution occurs due to inheritance of ACQUIRED TRAITS FROM A COMMON ANCESTOR, not from changes in the environmentIdea that variation in a population is created by experienceEx. Individuals passed on to offspring body and behavior changes acquired during life
  • 4. What is wrong with this idea?
  • 5. Theories of EvolutionB. Charles Darwin2 Major Theories:1. Descent with Modification: stated that ALLnew species were ALTERED DESCEDENTS ofOLDER ANCESTORS and arose from similargeographic locations
  • 6. 2. Natural Selection: proposes that NATURE orenvironmental conditions DETERMINE andindividual’s CHARACTERISTICS, which in turnleads to EVOLVING population over time
  • 7. 4 Mechanisms of Natural Selection
  • 8. o GENE VARIATION EXISTS WITHIN A POPULATION Only if variation is GENETICALLY BASED will natural selection lead to evolution -MUTATIONS and RECOMBINATION of genes may produce beneficial changes and INCREASE gene variation within a population
  • 9. o INDIVIDUALS WITH MORE SUCCESSFUL TRAITS WILL PASS TRAITS ON TO OFFSPRING -in turn, will increase the success of the population
  • 10. o INDIVIDUALS MOST ADAPTED TO THE ENVIRONMENT WOULD GET THE BASIC RESOURCES FOR LIFE -ADAPTATION: individuals response to environmental pressures – may reduce competition within a population
  • 11. o INDIVIDUALS THAT ARE MOST “FIT” HAVE GREATEST POTENTIAL TO REPRODUCE SUCCESSFULLY AND INCREASE POPULATION NUMBERS OVER TIME –”survival of the fittest”-FITNESS: reproductive success of one individuals genetic contribution to the next generation
  • 12. Examples of “fitness”• Bacterial resistance to antibiotics
  • 13. • Pesticide resistant insects
  • 14. • Skin color - melanin
  • 15. Summing Up Natural Selection

×