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Evolution__3rd_Edition

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94 PART 2 / <strong>Evolution</strong>ary Genetics<br />

important higher level interactions between gene loci are, and how far the one-locus<br />

model is an adequate description of the real world. As we move from two-locus evolution<br />

to multiple-locus evolution we abandon Mendelian exactitude and use a quite different<br />

method: quantitative genetics. In quantitative genetics (Chapter 9), the relations between<br />

individuals and between successive generations are described approximately and abstractly.<br />

Quantitative genetics is concerned with “continuous” characters, at the morphological level.<br />

As we saw in Chapter 4, morphological characters show variation in natural populations,<br />

and we shall consider how to account for the level of variation that is observed.<br />

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