Figure ii. Chromosome IV duplication in mec1 mutant cells. Genomic expression and genomic DNA content in mec1 versus wild-type and dun1 versus wild-type cells is shown. Approximately 6,200 yeast genes are organized according to their positions along the chromosomes (left panel), and roughly 800 genes localized to Chromosome IV are shown according to their position on the chromosome (right panel). The color scale representing relative mRNA and DNA levels is shown at the bottom of the figure