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MOLECULAR CLOCKS: Divergence Time & Sequence Differences,…
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CLASSIFICATION ERRORS
Classification based on traditional methods e.g. morphology, feeding patterns and other behavioural aspects has not always given accurate results for the relationships between organisms.
Linneus took it a step further and classified organisms into kingdoms, phyla, classes, orders, families, genera and species.
Aristotle once classified animals according to their environment and plants according to their size or shape.
New molecular evidence has shown that the classification of some groups did not correspond with the evolutionary origins of a group or species in previously made cladograms.
PHYLOGENETIC TREES
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These phylogenetic trees show evolutionary relationships between organisms, as cladograms do however phylogenetic trees have lines representative of the amount of time between organisms' ancestry.
DEFINITION: A diagram that represents evolutionary relationships among organisms based on physical and genetic similarities and differences.
Protein and DNA base-sequence technologies helped analyze biochemicals and improved the accuracy of cladistic analysis immensely. This technology has changed classification. Some groups have merged, and others have been split.
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