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Unformatted text preview: 3 1.1 Genes as determinants of the inherent properties of species The next sections of this chapter show how genes influence the inherent properties of a species and how allelic variation contributes to variation within a species. These sections are an overview; most of the details will be presented in later chapters. 1.1 Genes as determinants of the inherent properties of species What is the nature of genes, and how do they perform their biological roles? Three fundamental properties are required of genes and the DNA of which they are composed. 1. Replication. Hereditary molecules must be capable of being copied at two key stages of the life cycle (Figure 1-2). The first stage is the production of the cell type that will ensure the continuation of a species from one generation to the next. In plants and animals, these cells are the gametes: egg and sperm. The other stage is when the first cell of a new organism undergoes multiple rounds of division to produce a multicellular organism. In plants andto produce a multicellular organism....
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This note was uploaded on 01/10/2011 for the course BIOL BIOL taught by Professor Johnson during the Spring '08 term at Aberystwyth University.
- Spring '08