The fourth edition of this well-known text provides students, researchers and technicians in the area of medicine, genetics and cell biology with a concise, understandable introduction to the structure and behavior of human chromosomes. This new edition continues to cover both basic and up-to-date material on normal and defective chromosomes, yet is particularly strengthened by the complete revision of the material on the molecular genetics of chromosomes and chromosomal defects. The mapping and molecular analysis of chromosomes is one of the most exciting and active areas of modern biomedical research, and this book will be invaluable to scientists, students, technicians and physicians with an interest in the function and dysfunction of chromosomes.1 Origins and Directions of Human Cytogenetics.- 2 The Mitotic Cell Cycle.- 3 DNA Replication and Chromosome Reproduction.- 4 General Features of Mitotic Chromosomes.- 5 The Chemistry and Packaging of Chromosomes.- 6 Chromosome Bands.- 7 Molecular Correlates of Chromosome Bands.- 8 In Situ Hybridization.- 9 Main Features of Meiosis.- 10 Details of Meiosis.- 11 Meiotic Abnormalities: Abnormal Numbers of Chromosomes.- 12 Abnormal Phenotypes Due to Autosomal Aneuploidy or Polyploidy.- 13 Chromosome Structural Aberrations.- 14 The Causes of Structural Aberrations.- 15 Syndromes Due to Autosomal Deletions and Duplications.- 16 Clinical Importance of Translocations, Inversions, and Insertions.- 17 Sex Determination and the Y Chromosome.- 18 The X Chromosome, Dosage Compensation, and X Inactivation.- 19 Phenotypic Effects of Sex Chromosome Imbalance.- 20 Fragile Sites, Trinucleotide Repeat Expansion, and the Fragile X Syndrome.- 21 Euploid Chromosome Aberrations, Uniparental Disomy, and Genomic Imprinting.- 22 Chromosome Changes in Cell Differentiation.- 23 Somatic Cell Hybridization in Cytogenetic Analysis.- 24 Chromosome Instability Syndromes.- 25 DNA and Gene Amplification.- 26 Genome Destabilization and Multistep Progressiolc¿