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The Concept of a Species
Members of a species have certain things in common:
· They are similar to one another, but different from members
of other species. In other words, they have similar genes and
closely resemble one another physically and biochemically.
· They have similar patterns of development
· They have similar immunological features
· They occupy the same ecological niche
· They are capable of breeding to produce living, fertile
offspring
· They belong to the same gene pool…read more

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The Principles of Classification
1) ARTIFICIAL CLASSIFICATION
Divides organism according to differences that are useful at the
time, such as eye colour, size, number of legs etc. These are
described as analogous features; they have the same function
but do not have the same evolutionary origins.
2) NATURAL CLASSIFICATION
Is based on evolutionary relationships between organisms and
their ancestors, and arranges the group into a hierarchy, in
which the groups are contained within larger composite
groups, with no overlap.…read more

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Taxonomy
· Involves naming organisms, organising them into groups
based on similarities and differences.
· Kim Panisales Can Often Find Ginger Spices
· Organisms can only belong to one group at each level in the
hierarchy ­ there is no overlap.
· As you move down the hierarchy, there are more groups, but
fewer organism in each group.…read more

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Phylogeny
· The study of the evolutionary relationship between
organisms
· All organisms have evolved from shared common ancestors
· Phylogeny tells us who's related to whom and how closely
related they are.
· Closely related species diverged away from each other most
recently.…read more

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