Unformatted text preview: ly present. The goal of classification is to determine genetic
similarity, though in the past genetic similarity had to
be inferred based on phenotypic similarity.
As a consequence of the sequencing of organism
genomes, the science of classification is very much in
flux (classifications are changing often) as
phenotype-based classification is augmented by
All is not happy even with genotype-based
classification, however, since horizontal gene transfer
greatly complicates estimations of genetic similarity,
with different parts of genomes displaying different
levels of genetic similarity between organisms.
Note that though classification can be considered
strictly in terms of genetic similarity, traditionally in
genetics similarity is considered to be an indication of
“similarity by decent,” a.k.a., of blood relatedness,
a.k.a., of evolutionary relatedness. Taxonomic Rank Taxonomy: Classification We’ll consider each in turn. We’ll spend quite a bit of time in this chapter and in
lab on methods of bacterial identification. Strain O157:H7 One difficulty is deciding how different two isolates must be before one
describes them as different species rather than as dif...
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