Introduction to Genetic Analysis 17

Introduction to Genetic Analysis 17 - in many ways, about...

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16 Chapter 1 Genetics and the Organism Gene Bacterial chromosome Plasmid DNA-protein supercoil Bacteria Gene Gene Gene Gene Gene Gene Gene Gene Gene Gene Gene Gene Protists Fungi Plants Animals Nuclear chromosomes Mitochondrial chromosome Chloroplast chromosome (plants) Eukaryotic cell Prokaryotic cell Viruses Gene DNA DNA DNA DNA DNA DNA Figure 1-16 Structural comparison of the genome components of eukaryotes, prokaryotes, and viruses. 1.5 Genes, the environment, and the organism Genes cannot dictate the structure of an organism by themselves. The other crucial component in the formula is the environment. The environment inFuences gene action
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Unformatted text preview: in many ways, about which we shall learn in subsequent chapters. Most concretely perhaps, the environment pro-vides the raw materials for the synthetic processes con-trolled by genes. An acorn becomes an oak tree, by using in the process only water, oxygen, carbon dioxide, some inorganic materials from the soil, and light energy. Model I: genetic determination It is clear that virtually all the differences between species are determined by the differences in their 44200_01_p1-26 3/2/04 4:01 PM Page 16...
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