Final answer:
A heat map is a type of map that represents low to high frequency across a cell array, such as gene expression patterns in microarray analysis.
Step-by-step explanation:
The type of map that represents low to high frequency across a cell array is a heat map.
In microarray analysis, gene expression patterns are compared between cancerous cells and healthy cells using microarray technology. The resulting information can be expressed as a heat map, where different shades of colors represent the expression level of genes. Genes that are expressed only in cancer cells, normal cells, or both can be visually represented on the heat map.
For example, in a microarray heat map, genes expressed only in cancer cells may be shown in varying shades of red, genes expressed only in normal cells may be shown in varying shades of green, and genes expressed in both cancerous and normal cells may be shown in yellow.