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Biology-Ch.25 Response

Biology-Ch.25 Response - Phylogeny is what is analyzed in...

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Ch. 25 Response Ch.25: What is systematics? Systematics refers to the study of biological diversity and a method of relating and organizing past and present organisms in an evolutionary context. The most commonly used system of viewing the relationships between organisms is the use of cladograms, evolutionary trees which analyze molecular, morphological, and other characteristics of species. Cladograms consist of branches with similar species along the length. Start at any one and go down, every organism below it will have at least one trait in common. Go up and every organism above it will not have that trait.
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Unformatted text preview: Phylogeny is what is analyzed in systematics. In other words, it is the study of evolutionary relatedness among groups of different organisms. The evidence that is used to understand these relationships includes morphological homologies and molecular homologies. Morphological homologies can be studied by simply looking at various organisms or fossils (trace, mineral, and others). Molecular homologies can be found by studying different organisms DNA and finding similarities. • http://en.wikipedia.org/wiki/Systematics • http://en.wikipedia.org/wiki/Phylogeny...
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