Adaptive Radiation - Speciation and Adaptive Radiation Guiding Question How do new species form BACKGROUND Your task is to investigate a collection of

Adaptive Radiation - Speciation and Adaptive Radiation...

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Speciation and Adaptive Radiation Guiding Question: How do new species form? BACKGROUND: Your task is to investigate a collection of case study examples to illustrate the concepts of speciation and adaptive radiation. As you work, consider: the definitions of a biological species. pre-zygotic and post-zygotic barriers that keep species distinct. how isolation is essential for the development of a new species. Example#1: California Salamanders Before responding to the following questions, view Video #1: California Salamanders through this video . 1. A " ring species " is a situation in which a connected series of neighboring populations can each interbreed with their neighbors--closely related populations. However, the more distant species are from each other geographically, the less related they are to each other, thus decreasing the amount of gene flow between "non- linked" populations. Using the salamanders as an example, how is it that "ring species" at the end of the ring can be distant, but gene flow occurs along the ring? The ring species are the species that will reproduce with each other and this will allow their offspring to receive their genes . Generations after generations, the traits will be passed on and can be seen at the other end of the ring. This is how the salamanders shared the traits of color adaptation and camoflauge. 2. From what you know about pre-zygotic and post-zygotic barriers to reproduction, what is the condition of the hybrids at the end of the ring? Are they able to successfully breed and become a new species? View this link from UC Berkeley for additional information. The conditions of the hybrids at the end of the ring shows that the ability for the hybrid to survive has decreased by a significant amount since the inherited characteristics were not helpful to their chances of survival.
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  • Fall '15
  • Eric Martin
  • Speciation and Adaptive Radiation, California Salamanders

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