Which of the following technologies is NOT commonly used in genomics?

Electrophoresis, while a fundamental technique in molecular biology, is not primarily associated with genomics in the same way as the other options. In genomics, the focus is primarily on analyzing entire genomes, their sequences, and variations. Next-generation sequencing is a cornerstone technology that allows for the rapid sequencing of DNA, providing massive amounts of data essential for genomics studies. Polymerase chain reaction (PCR) is pivotal for amplifying DNA samples, facilitating the analysis of genes and genomic regions, and is widely used in various genomic applications. Microarrays enable the simultaneous study of thousands of genes, allowing researchers to analyze gene expression patterns across different conditions or tissues, which is a central aspect of genomics research.

Electrophoresis does play a role in some genomic applications, such as in analyzing the size of DNA fragments or in the context of sequencing, but it is not a direct tool for genome sequencing or comprehensive genomic analysis themselves. Instead, it serves more as an ancillary technique for purification and size determination rather than being a linchpin technology in genomics research.