Speciation 2

791 views
726 views

Published on

Published in: Spiritual, Technology
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
791
On SlideShare
0
From Embeds
0
Number of Embeds
2
Actions
Shares
0
Downloads
9
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Speciation 2

  1. 1. Speciation: Creation of Different Species
  2. 2. <ul><li>Evolution by the process of natural selection eventually leads to speciation. </li></ul><ul><li>Speciation: formation of a new species </li></ul>
  3. 3. <ul><li>Species: </li></ul><ul><li>A group of similar organisms that can inter-breed and produce fertile offspring </li></ul><ul><li>Members of same species share a common gene pool </li></ul>
  4. 4. <ul><li>Speciation occurs when a common group of organisms becomes two or more separate groups </li></ul><ul><li>New group(s) are reproductively isolated </li></ul>
  5. 5. <ul><li>3 mechanisms of Reproductive isolation </li></ul><ul><ul><li>Geographical </li></ul></ul><ul><ul><li>Behavioral </li></ul></ul><ul><ul><li>Temporal </li></ul></ul>
  6. 6. <ul><li>Geographical- populations are separated by physical barriers. </li></ul><ul><li>Rivers </li></ul><ul><li>Mountains </li></ul><ul><li>Bodies of water </li></ul>
  7. 7. <ul><li>Behavioral- Different courtship rituals </li></ul><ul><li>Mating songs </li></ul><ul><li>Mating dances </li></ul>
  8. 8. <ul><li>Temporal (time) Populations mate at different times </li></ul><ul><li>Spring vs Fall </li></ul><ul><li>Night vs Day </li></ul><ul><li>Lunar cycle </li></ul>
  9. 9. <ul><li>Speciation can occur quickly or slowly </li></ul><ul><li>1. Gradualism: evolution occurs at a slow, steady rate </li></ul><ul><li>2. Punctuated equilibrium- evolution occurs relatively quickly (10,000 years or less) in rapid bursts </li></ul><ul><li>What do you think the fossil record would look like for these two types of speciation? </li></ul>
  10. 10. Patterns of Evolution <ul><li>1. Adaptive radiation </li></ul><ul><li>An ancestral species evolves into several species in order to fit diverse habitats. Frequently seen on island chains (hint)- Where have you seen this? </li></ul>
  11. 11. Darwin’s Finches
  12. 12. <ul><li>2. Convergent evolution </li></ul><ul><li>Two unrelated species in two different parts of the world develop similar features. </li></ul><ul><li>Why would two unrelated species of plant or fish look so much alike? </li></ul>
  13. 13. Organ pipe cactus (l) and Euphorbia (R): fleshy bodies, no leaves

×