Methods used to classify prokaryotes according to their genotype include G + C content, DNA hybridization, and comparing the sequences of 16S ribosomal nucleic acid.
■ Explain why two organisms that have identical GC contents might be completely unrelated.
■ Explain why 16S rDNA has proved so useful in determining evolutionary relatedness.
■ Why would it be easier to sequence rDNA than rRNA?
Figure 10.18 A Phylogenetic Tree Each branch represents the evolutionary distance between two species. An external node, marked with a species name, represents an organism that still exists. An internal node, a branch point, represents an ancestor to today's organisms.
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