The hybridization technique that uses pieces of glass about the size of a postage stamp that are embedded with single-stranded DNA sequences from specific genes with known functions is called:

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The description matches DNA microarrays, which are also sometimes called DNA chips or gene chips. The technique involves using a small piece of glass or silicon that has been etched with thousands of microscopic spots, or features, each containing a different single-stranded DNA sequence that can hybridize with DNA or RNA from a sample. This allows researchers to detect and analyze the expression of many genes at once.

The Hybridization Technique That Uses Pieces of Glass About the Size