Speciation and Subspecies - PowerPoint PPT Presentation

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Speciation and Subspecies

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Speciation and Subspecies Looking at rattlesnakes of the east coast New species As organisms accumulate more differences between groups, the groups become less and ... – PowerPoint PPT presentation

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Title: Speciation and Subspecies


1
Speciation and Subspecies
  • Looking at rattlesnakes of the east coast

2
New species
  • As organisms accumulate more differences between
    groups, the groups become less and less alike.
  • This change is called divergence
  • Divergence will eventually lead to the creation
    of a new species.

3
Subspecies
  • As a group of organisms diverge from the original
    they eventually will become a subspecies.
  • A subspecies means the two groups are genetically
    different, but can still breed together.

4
Examples of Speciation
  • Timber rattlesnake of the east coast are
    identifiable to their state based on color.
  • Dark ones..
  • New York

5
Examples of Speciation
  • Medium tone snakes
  • Pennsylvania

6
Examples of Speciation
  • Light tone snakes
  • Virginia

7
Examples of Speciation
  • The darker the snakes the colder the climate.
  • How did this variation become noticeable ?
  • What factors drove these changes?

8
Subspecies
  • Right now, even though there are genetic
    differences all of the populations of timber
    rattlesnakes are able to breed if they came in
    contact with one another.
  • Therefore they are not considered a subspecies or
    separate species.

9
Examples of Speciation
  • If these population continue to change what will
    happen?
  • What will be the first step in speciation?

10
Speciation
  • Speciation is the point at which two groups of
    individuals are no longer able to breed.
  • Making them a new species.
  • What is the time frame for speciation to occur?
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