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· They are similar to each other but different to
others; similar genes; (resemble each other
biochemically and physically); similar patterns
of development; similar immunological
features; occupy the same ecological niche
· Capable of breeding to produce fertile living
offspring; belong to the same gene pool…read more

Slide 3

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Systems of
classification
BINOMIAL SYSTEM TAXONOMY
· Organisms identified by 2 names; their · ARTIFICIAL: Analogous characteristics; they
generic name (Homo) and their species have the same function but different
name (sapien) evolutionary origins (e.g. wing of a bird and
Domain the wing of a butterfly.)
Kingdom
· NATURAL: Homologous classification; based
Phylum upon evolutionary relationships between
Class organisms and ancestors; classifies species
into groups using shared features derived
Order from ancestors; arranges groups into a
Family hierarchy.
Genus
Species…read more

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Phylogeny
·Shows the evolutionary
relationship between
organisms
·The closer the branch, the
closer the relationship…read more

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Species not fixed forever , they change/evolve over
time
· Considerable variation among individuals within a
species
· Many species are extinct with no fossil record
· Some species rarely reproduce sexually
Difficulties
in defining
· Members of same species may be isolated and so
never meet and interbreed
· Some species are sterile a species…read more

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