Final answer:
To study the expression of a few genes, methods such as Microarray Analysis, which compares gene expression patterns, and PCR, which amplifies specific DNA segments, can be used. RNA-Seq and Whole Genome Sequencing offer broader genomic insights but are less targeted for few genes.
Step-by-step explanation:
When studying the expression of a few genes, several methods can be employed. Microarray Analysis is a technique where DNA fragments are fixed to a slide or silicon chip, which helps in detecting gene expression by identifying active genes. This method is useful for comparing gene expression patterns, for example, between cancerous and healthy cells.
PCR (Polymerase Chain Reaction) is another method that can be specifically used to amplify and study the expression of a few genes by creating multiple copies of a particular segment of DNA, allowing detailed examination.
While RNA-Seq is a sequencing method used to get a snapshot of the mRNA in a cell at a particular moment, providing insights into which genes are being expressed and at what levels, this might be more relevant for a broader gene expression study rather than a few specific genes.
Last but not least, Whole Genome Sequencing provides information on the entire genome, but is not typically targeted towards the expressions of just a few genes due to its extensive and wide-ranging nature.