Biology powerpoint 11

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Author:
zzto
ID:
134275
Filename:
Biology powerpoint 11
Updated:
2012-02-10 11:48:35
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Biology 1200 specialization
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Biology 1200 specialization
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  1. Look identical morphologically, but are reproductively isolated
    Cryptic Species
  2. Phylogenetic Species Concept
    smallest monophyletic groups on the tree of life
  3. Monophyletic group
    A group that consists of an ancestral population and all of its descendants and only its descendants!
  4. Prezygotic isolation
    mechanical barrier
  5. Postzygotic Isolation •Zygote does not develop, or embryo aborts •Hybrids die before sexual maturity •Hybrid sterility
    • •Zygote does not develop, or embryo aborts
    • •Hybrids die before sexual maturity
    • •Hybrid sterility
  6. Problems with the Biological Species Concept
    •Asexual organisms •Fossils •Hybridization
  7. Monophyly is defined
    by at least one derived trait that is unique to the group and occurs in all members of the grou
  8. The shared, derived trait is called
    asynapomorphy
  9. What are the Species concepts
    • • Biological Species Concept
    • • Morphospecies Concept
    • • Phylogenetic Species Concept
  10. Morphospecies Concept• based on differences in shape, size, orother morphological features
    • based on differences in shape, size, orother morphological features

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