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UNIT 2 BIOLOGY…read more

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Slide 3

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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
· They belong to the same gene pool…read more

Slide 4

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The Principles of 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.
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

Slide 5

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· 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

Slide 6

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· The study of the evolutionary relationship between
· 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

Slide 7

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