1. Some common human syndromes -- 2. Chromosome structure and cell division -- 3. Formation of the germ cell -- 4. Simple inheritance -- 5. Gene action -- 6. Sex determination -- 7. Sex-linked inheritance -- 8. Abnormal human chromosome: Structure and transmission; cancer -- 9. Genetic counseling -- 10. Locating genes -- 11. The blood groups -- 12. The immune system: Transplantation and related problems -- 13. Mutation -- 14. Chemical compounds causing genetic damage -- 15. The basis for induced genetic change -- 16. Prenatal development -- 17. Twinning -- 18. Behavior and intelligence -- 19. Genes in populations -- 20. Genetic variation in human populations -- 21. Manipulation of the human genetic system