The Evolution of Species

                      Kendall W. Corbin                 

Unifying Principles of Biology, Show 5: The Evolution of Species

Unifying Principles in Microsoft PowerPoint Show 5

Revised 6/28/2013

  1. Every species evolved from some other pre-existing species.
  2. Ancestral species share traits with species that evolved from them.
    a. Large portions of their genomes have identical nucleotide base-pair sequences in their DNA molecules.
    b. Some of their organ and organelle structures are identical or very similar.
    c. Some of their behaviors are identical or very similar.
  3. Species have been evolving on our planet for about 3.5 billion years.
  4. Species are reproductively isolated from one another; they do not exchange genes.
  5. There are four primary modes of speciation: allopatric, sympatric, autopolyploidy, and allopolyploidy.
  6. During allopatric speciation, reproductive isolation is achieved via extrinsic and intrinsic mechanisms.
  7. During sympatric speciation, reproductive isolation is achieved via changes in the number and size of chromosomes.
  8. During autopolyploidy, reproductive isolation is achieved via changes in the number of chromosomes that must pair during meiosis within a single species.
  9. During allopolyploidy, reproductive isolation is achieved via changes in the number of chromosomes that must pair during hybridization between closely related species.

As an example of the style and formatting of the material, the slide show to the right includes only some of the slides in the complete presentation, which on average will take about 55 minutes to give as a lecture.

Examples of Slides in this Ppt Show

 

2013 Kendall W. Corbin, Ph.D.. All Rights Reserved

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