tag, so that the individual’s genotypes can be determined simultaneously for millions of SNPs. Not only can microarrays be used to probe the entire genome, they can also be used to assess gene expression levels and to map ncRNA by indexing RNA transcripts, both protein-coding and non-coding (the transcriptome). An important direction for genetic research in the future will be to relate the genome to the transcriptome (Plomin & Schalkwyk, 2007).
