  A structural genetic model incorporating a modern understanding of the genome
and common practice in genome-wide association studies is derived
mathematically. The model shows the Haldane map distance as a direct
consequence of the structure of the genome. An expression for genetic
correlation is derived under the model and compared to data resulting from the
BSB mouse cross. A correlation test plot is introduced for this comparison and
shows the close agreement of the model and empirical results. Noteworthy
departures in this plot indicate regions which warrant further investigation.
