<prompt> Which of the following tests is used to differentiate the chromosome of normal and cancer cells?PCRComparative genomic hybridizationWestern blottingKaryotyping  <response>: Comparative genomic hybridization CGH differentiates between cancer and normal cells. Comparative genomic hybridization CGH Method that can be used only when DNA is available from a specimen of interest. Mixed in equal amounts and hybridized to normal metaphase chromosomes. Red-to-green ratio is analyzed by a computer program that determines where the DNA of interest may have gains or losses of material. 