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Phylogeny and Modern T axonomy

Phylogeny and Modern T axonomy. Phylogeny. Study of evolutionary relationships among species Relationships can be presented in a PHYLOGENIC TREE Like a large family tree where descendants share a common ancestor. Deep Time Video. A Closer Look… …A Branch of Phylogenic Tree.

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Phylogeny and Modern T axonomy

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  1. Phylogeny and Modern Taxonomy

  2. Phylogeny • Study of evolutionary relationships among species • Relationships can be presented in a PHYLOGENIC TREE • Like a large family tree where descendants share a common ancestor.

  3. Deep Time Video

  4. A Closer Look… …A Branch of Phylogenic Tree • A CLADE shows a group of species that ALL share a common ancestor. Clades can be small: – including only recent ancestors; or large: – including more distant ancestors

  5. Creating the Phylogenic Trees • For species alive today, scientists often use morphological characteristics to help determine relatedness • For older species it is much more difficult, thus fossil records and genetic analysis is more common.

  6. Other uses of genetic analysis • Identify species from a tiny sample of DNA • Control trafficking of products made from endangered species • False labeling of fish products in markets • Of 153 samples in Canadian grocery stores 34 were mislabeled!! • Labeled wild – really farm raised • Labeled Cod really Haddock • Eventually used to routinely monitor biodiversity in whole ecosystems

  7. HMK: • Work your way through the Tutorial 1 on pg 22-23 and answer the practice questions. • Questions 9 and 10 on pg 25

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