Pathology Question: In ionizing radiation, cells in G1 phase of the cell cycle are most sensitive? Pathology Interview QuestionAnswer: False Previous QuestionNext QuestionThere are about 40 000 human genes and ESTs (expressed sequence tags) available on the Affymetrix Gene Chips for gene expression. Make some reasonable assumptions and estimate, for a normal organ, the number of genes that will appear to be expressed significantly greater than or less than the population norm (95% confidence interval).In ionizing radiation, mitosis does not occur in irradiated cells?