Final answer:
Microarray technology allows for the examination of many thousands of genes at once to find differences in gene expression patterns.
Step-by-step explanation:
Microarray technology is a nucleic acid hybridization technique used for the examination of many thousands of genes at once to find differences in gene expression patterns. It involves immobilizing DNA or cDNA fragments on a chip, labeling them with different fluorescent dyes, and comparing the sequences or gene-expression patterns. This technique is often used to compare gene-expression patterns between different cell types or to study the effects of treatments, diseases, and developmental stages on gene expression.