Fetal DNA analysis / John M. Old -- Use of synthetic oligonucleotides as specific hybridization probes in the diagnosis of genetic disorders / Swee Lay Thein, Ali Ehsani and R. Bruce Wallace --Pulsed-field gel electrophoresis in the analysis of genomic DNa and YAC clones / J.T. den Dunnen, P.M. Grootscholten and G.J.B. van Ommen --Fluorescent in situ hybridization / V.J. Buckle and K.A. Rack -- Fine mapping of genes: the characterization of the transcriptional unit / M. Antoniou, E. deBoer and F. Grosveld -- Chromosome analysis and sorting by flow cytometry / S. Monard, L. Kearney and B.D. Young