In reverse genetics, what is the correct order in which the experimenter proceeds? A. identification of a gene of interest followed by screening for mutations in that gene and studies of the phenotypes caused those mutations. B. selection of mutants with a phenotype of interest and then mapping to locate the effected gene(s) C. silencing the genes in question using RNAi, followed by mapping to locate the gene D. random mutagenesis, followed by observation of offspring for newly acquired traits