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<p><b>Genomics</b> is a discipline in genetics [[omics]] concerning the study of the genomes of organisms. </p><p>The field includes intensive efforts to determine the entire <a class="mw-redirect" title="DNA sequence" href="http://en.wikipedia.org/wiki/DNA_sequence">DNA sequence</a> of organisms and fine-scale <a class="mw-redirect" title="Genetic mapping" href="http://en.wikipedia.org/wiki/Genetic_mapping">genetic mapping</a> efforts. The field also includes studies of intragenomic phenomena such as heterosis, epistasis, <a title="Pleiotropy" href="http://en.wikipedia.org/wiki/Pleiotropy">pleiotropy</a> and other interactions between loci and alleles within the genome. In contrast, the investigation of the roles and functions of single genes is a primary focus of <a title="Molecular biology" href="http://en.wikipedia.org/wiki/Molecular_biology">molecular biology</a> or <a title="Genetics" href="http://en.wikipedia.org/wiki/Genetics">genetics</a> and is a common topic of modern medical and biological research. Research of single genes does not fall into the definition of genomics unless the aim of this genetic, pathway, and functional information analysis is to elucidate its effect on, place in, and response to the entire genome's networks.</p>