Plant Molecular Systematics (Phylogenetics)

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Plant Molecular Systematics (Phylogenetics)
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• Systematics classifies species based on
  similarity of traits and possible mechanisms of
  evolution, a change in the gene pool of a
  population over time.
• Phylogenetic systematics is that field of biology
  that does deal with identifying and understanding
  the evolutionary relationships among the many
  different kinds of life on earth, both living and
  dead. Evolutionary theory states that similarity
  among individuals or species is attributable to
  common descent, or inheritance from a common
  ancestor.
• Evolution requires genetic variation which
  results from changes within a gene pool, the
  genetic make-up of a specific population.

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Nodes, each represent a taxonomic unit (species,
populations, individuals), Branches, define the
relationship between the taxonomic units in terms
of descent and ancestry. Branch length usually
represents the number of changes that have
occurred in the branch. Root, representing a
common ancestor, from which a unique path leads
to any other node. Unrooted tree only specifies
the relationship among species, without
identifying a common ancestor, or evolutionary
path.
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In this case, an outgroup could be a gene from
another primate, such as baboon, which is known
to have branched away from the four species above
before the common ancestor of the species.
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Plant Molecular Systematics (Phylogenetics)

• BY Mary Beth Craig

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Definitions

• Wikipedia.com defines Molecular Systematics a
  product of the traditional field of systematics
  and the growing field of bioinformatics. It is
  the process of using data on the molecular
  constitution of biological organisms' DNA, RNA,
  or both, in order to resolve questions in
  systematics, i.e. about their correct scientific
  classification or taxonomy from the point of view
  of evolutionary biology. It is also known as
  computational systematics. It may also be
  referred to as molecular genetics or molecular
  evolution.

• Phylogeny is the origin and evolution of a set of
  organisms, usually of a species. Wikipedia.com

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Pictures of DNA RNA
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Examples of Phylogenetic Trees
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Plants from Genus Phlox