Final answer:
Methods for studying gene expression include using reporter genes, reverse genetics, and microarray analysis.
Step-by-step explanation:
One method for studying the expression of a few genes is to use reporter genes that encode easily observable characteristics. These reporter genes can be attached to the genes of interest, allowing researchers to easily monitor their expression. For example, genes encoding beta-galactosidase or green fluorescent protein (GFP) can be used as reporter genes to track the expression of other genes.
Another method is reverse genetics, which involves starting with a specific DNA sequence and determining what phenotype it produces. This technique can help determine the function of specific genes. Microarray analysis is also a useful technique for studying gene expression patterns. It involves comparing gene expression patterns between different cell types or conditions, such as cancerous cells versus healthy cells.