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PHYLOGENY

PHYLOGENY. “The Family Tree”. Genetic variations lead to modifications in design & function Eventually a split occurs in the lineage Creates a branching pattern of evolutionary relationships “Root” = ancestor “Branch tips” = descendants. Speciation. Origin of a species

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PHYLOGENY

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  1. PHYLOGENY

  2. “The Family Tree” • Genetic variations lead to modifications in design & function • Eventually a split occurs in the lineage • Creates a branching pattern of evolutionary relationships • “Root” = ancestor • “Branch tips” = descendants

  3. Speciation • Origin of a species • “Splitting of a branch” • Single ancestral lineage gives rise to two or more lineages

  4. Shared & Unique History • Part of lineage history is: • unique to its own • shared with other lineages

  5. Common Ancestry • each lineage has ancestors that are unique to that lineage and ancestors that are shared with other lineages

  6. Clade • grouping that includes a common ancestor and all the descendents (living and extinct) • “Pruning” metaphor • all of the organisms on that clipped branch make up a clade.

  7. Clades in Clades • Notice how clades are nested within larger clades. • Example: cats, lions and tigers belong to the Feline clade which belongs to the much larger Mammal clade, which belongs to the much, much larger Chordate clade.

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