speciation n.
Skip this Video
Loading SlideShow in 5 Seconds..
Speciation PowerPoint Presentation
Download Presentation

Loading in 2 Seconds...

play fullscreen
1 / 9

Speciation - PowerPoint PPT Presentation

  • Uploaded on

Speciation. Not as easy as it seems. Evolution creates and destroys new species. What is a species?. What is a species?. These are all one specie!. We will define a specie as:. A group of organisms that has the ability to interbreed and produce fertile offspring.

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
Download Presentation

PowerPoint Slideshow about 'Speciation' - jadzia

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

Not as easy as it seems

what is a species1
What is a species?

These are all one specie!

we will define a specie as
We will define a specie as:
  • A group of organisms that has the ability to interbreed and produce fertile offspring.
  • For example, these happy face spiders look different, but since they can interbreed, they are considered the same species: Theridiongrallator.
how do species arise
How do species arise?
  • Reproductive isolation of populations is key.
    • Geographical isolation- It occurs when populations are separated by geographic barriers such as rivers, mountains, or bodies of water.
  • Harris’ antelope squirrel
  • White-tailed antelope squirrel
temporal isolation
Temporal Isolation
  • Breed at different times.
    • These are closely related species, but the American toad mates in the early part of summer, while the Fowler's toad mates later in the season.
    • Flowering plants may be temporally isolated if their flowers do not open at the same time of day. When this occurs, pollen cannot be transferred between the two different plants, so there cannot be fertilization.
behavioral isolation
Behavioral Isolation
  • It occurs when populations are capable of interbreeding but have differences in courtship rituals or other types of behavior.
speciation dynamics
Speciation Dynamics

Phylogenic trees

Darwin vs Gould