Functional genomics is the science of determining the effects that segments of the genome or genes have on biological processes. Functional genomics is amenable to the study of gene expression for virtually all genes in the genome (thus the term genomics). However, it could be argued that the term applies to other types of ''functions.'' A broader definition of functional genomics suggests that there are at least three strategic approaches at the genome level that describe functional genomics. The first approach uses genomic scans to identify loci affecting phe-notypes of interest. A second approach monitors gene expression on a genome-wide scale (micro arrays), and the third is the use of genomic sequence comparisons across species to identify functional DNA elements.
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