KEY CONCEPT Modern classification is based on evolutionary relationships. - PowerPoint PPT Presentation

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KEY CONCEPT Modern classification is based on evolutionary relationships.

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KEY CONCEPT Modern classification is based on evolutionary relationships. Cladistics is classification based on common ancestry. Phylogeny is the evolutionary history ... – PowerPoint PPT presentation

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Title: KEY CONCEPT Modern classification is based on evolutionary relationships.


1
KEY CONCEPT Modern classification is based on
evolutionary relationships.
2
Cladistics is classification based on common
ancestry.
  • Phylogeny is the evolutionary history for a group
    of species.
  • evidence from living species, fossil record, and
    molecular data
  • shown with branching tree diagrams

3
  • Cladistics is a common method to make
    evolutionary trees.
  • classification based on common ancestry
  • species placed in order that they descended from
    common ancestor

4
  • A cladogram is an evolutionary tree made using
    cladistics.
  • A clade is a group of species that shares a
    common ancestor.
  • Each species in a clade shares some traits with
    the ancestor.
  • Each species in a clade has traits that have
    changed.

5
  • Derived characters are traits shared in different
    degrees by clade members.
  • basis of arranging species in cladogram
  • more closely related species share more derived
    characters
  • represented on cladogram as hash marks

6
  • Nodes represent the most recent common ancestor
    of a clade.
  • Clades can be identified by snipping a branch
    under a node.

FEATHERS AND TOOTHLESS BEAKS.
SKULL OPENINGS IN FRONT OF THE EYE AND IN THE JAW
OPENING IN THE SIDE OF THE SKULL
SKULL OPENINGS BEHIND THE EYE
EMBRYO PROTECTED BY AMNIOTIC FLUID
7
Molecular evidence reveals species relatedness.
  • Molecular data may confirm classification based
    on physical similarities.
  • Molecular data may lead scientists to propose a
    new classification.
  • DNA is usually given the last word by scientists.
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