References
- Abroms , K. I. and Bennett , J. W. 1981 . “ Parental contributions to trisomy-21. Review of recent cytological and statistical findings ” . In Frontiers of knowledge in mental retardation, Vol. II. Biomedical aspects , Edited by: Mittler , P. 149 – 157 . Baltimore : University Park Press .
- Adams , M. M. , Erickson , J. D. , Layda , P. M. and Oakley , G. P. 1981a . Down's syndrome: recent trends in the United States . Journal of the American Medical Association , 246 : 758 – 760 .
- Adams , M. M. , Finley , S. and Hansen , H. 1981b . Utilization of prenatal genetic diagnosis in women ≥ 35 years, United States, 1977–78 . American Journal of Obstetrics and Gynecology , 139 : 673 – 677 .
- Avers , C. J. 1980 . Genetics , New York : Van Nostrand .
- Ayala , F. J. and Kiger , J. A. Jr. 1980 . Modern genetics , Menlo Park, California : Benjamin Cummings .
- Baer , A. S. 1977 . The genetic perspective , Philadelphia : W. S. Saunders .
- Bishop , M. W. H. and Walton , A. 1956 . “ Spermatogenesis and the structure of mammalian spermatozoa ” . In Marshall's physiology of reproduction , Edited by: Parkes , A. S. Vol. I , 1 – 129 . London : Longman . part 2
- Brambell , F. W. R. 1956 . “ Ovarian changes ” . In Marshall's physiology of reproduction , Edited by: Parkes , A. S. Vol. I , 397 – 542 . London : Longman . Part 1
- Burns , G. W. 1980 . The science of genetics , 4th edn , New York : Macmillan .
- Denver Convention . 1960 . A proposed standard of nomenclature of human mitotic chromosomes . Journal of Heredity , 51 : 221 – 241 .
- Erickson , J. D. 1979 . Paternal age and Down syndrome . American Journal of Human Genetics , 31 : 489 – 497 .
- Fristrom , J. W. and Spieth , P. T. 1980 . Principles of genetics , New York : Chiron Press .
- Gardner , E. J. and Snustad , D. P. 1981 . Principles of genetics , 6th edn , New York : John Wiley .
- Goodenough , U. 1978 . Genetics , 2nd edn , New York : Holt, Rinehart and Winston .
- Hansen , H. 1978 . Decline of Down's syndrome after abortion reform in New York State . American Journal of Mental Deficiency , 83 : 185 – 188 .
- Harris , H. 1974 . Lionel Sharpies Penrose (1898–1972) . Journal of Medical Genetics , 11 : 1 – 24 .
- Hartl , D. L. 1977 . Our uncertain heritage: genetics and human diversity , Philadelphia : J. B. Lippincott .
- Herskowitz , I. H. 1979 . The elements of genetics , New York : Macmillan .
- Hexter , W. and Yost , H. T. Jr. 1976 . The science of genetics , Englewood Cliffs, New Jersey : Prentice-Hall .
- Holmes , L. D. 1978 . Genetic counseling for the older pregnant woman: new data and questions . New England Journal of Medicine , 298 : 1419 – 1421 .
- Hook , E. B. 1978 . Spontaneous deaths of fetuses with chromosomal abnormalities diagnosed prenatally . New England Journal of Medicine , 299 : 1036 – 1038 .
- Hook , E. B. , Cross , P. K. , Lamson , S. H. , Regal , R. R. , Baird , P. A. and Uh , S. H. 1981 . Paternal age and Down syndrome in British Columbia . American Journal of Human Genetics , 33 : 123 – 128 .
- Jenkins , J. B. 1979 . Genetics , Boston : Houghton Mifflin .
- Jenkins , R. L. 1933 . Etiology of mongolism . American Journal of Diseases of Children , 45 : 506 – 519 .
- Lejeune , J. , Gautier , M. and Turpin , R. 1959 . Etude des chromosomes somatiques de neuf enfants mongoliens . Académie des Sciences Paris Comptes Rendus (Paris) , 248 : 1721 – 1722 .
- Levine , L. 1980 . Biology of the gene , St Louis : C. V. Mosby .
- Licznerski , G. and Lindsten , J. 1972 . Trisomy-21 in man due to maternal nondisjunction during the first meiotic division . Hereditas , 70 : 153 – 154 .
- Lilienfeld , A. M. and Benesch , C. H. 1969 . Epidemiology of mongolism , Baltimore : John Hopkins Press .
- Magenis , R. E. , Overton , K. M. , Chamberlin , J. , Brady , T. and Lovrien , E. 1977 . Paternal origin of the extra chromosome in Down's syndrome . Human Genetics , 37 : 7 – 16 .
- Mange , A. P. and Mange , E. J. 1980 . Genetics: human aspects , Philadelphia : Saunders College .
- Matsunaga , E. , Tonomura , A. , Oishi , H. and Kikuchi , Y. 1978 . Reexamination of paternal age effect in Down's syndrome . Human Genetics , 40 : 259 – 268 .
- Mays , L. L. 1981 . Genetics: a molecular approach , New York : Macmillan .
- Merrell , D. J. 1975 . An introduction to genetics , New York : Norton .
- Novitski , E. 1977 . Human genetics , New York : Macmillan .
- Pai , A. C. and Marcus-Roberts , H. 1981 . Genetics: its concepts and implications , Englewood Cliffs, New Jersey : Prentice-Hall .
- Standardization in human cytogenetics. Birth defects: March of dimes. Original Article Series, VIII: 7, 1972 . Paris Conference . New York : The National Foundation .
- Patt , D. I. and Patt , G. R. 1975 . An introduction to modern genetics , Reading, Massachusetts : Addison-Wesley .
- Penrose , L. S. 1933 . The relative effects of paternal and maternal age in mongolism . Journal of Genetics , 27 : 219 – 224 .
- Penrose , L. S. 1967 . The effects of change in maternal age distribution upon the incidence of mongolism . Journal of Mental Deficiency Research , 11 : 54 – 57 .
- Punnett , H. H. and Kistenmacher , M. L. 1973 . Paternal origin of the extra chromosome in trisomy-21 . Genetics , 74 : 222 Supp.
- Rothwell , N. V. 1977 . Human genetics , Englewood Cliffs, New Jersey : Prentice-Hall .
- Rothwell , N. V. 1979 . Understanding genetics , 2nd edn , Oxford University Press .
- Russell , P. J. 1980 . Lecture notes on genetics , Oxford : Blackwell Scientific Publications .
- Sasaki , M. and Hara , Y. 1973 . Paternal origin of the extra chromosome in Down's syndrome . Lancet , 2 : 1257 – 1258 .
- Smith , G. F. and Berg , J. M. 1976 . Down's anomaly , Edinburgh : Churchill Livingstone .
- Stene , J. , Fischer , G. , Stene , E. , Mikkelsen , M. and Petersen , E. 1977 . Paternal age effect in Down's syndrome . Annals of Human Genetics, London , 40 : 299 – 306 .
- Stine , G. J. 1977 . Biosocial genetics: human heredity and social issues , New York : Macmillan .
- Strickberger , M. W. 1976 . Genetics , 2nd edn , New York : Macmillan .
- Sutton , H. E. 1975 . An introduction to human genetics , 2nd edn , New York : Holt, Rinehart and Winston .
- Suzuki , D. T. , Griffiths , A. J. F. and Lewontin , R. C. 1981 . An introduction to genetic analysis , 2nd edn , San Francisco : W. H. Freeman .
- Tjio , H. H. and Levan , A. 1956 . The chromosome number of man . Hereditas , 42 : 1 – 6 .
- Uchida , I. A. 1973 . Paternal origin of the extra chromosome in Down's syndrome . Lancet , 2 : 1258
- Wagner , R. P. , Judd , B. H. , Sanders , B. G. and Richardson , R. H. 1980 . Introduction to modern genetics , New York : John Wiley .
- Winchester , A. M. 1977 . Genetics: a survey of the principles of heredity , 5th edn , Boston : Houghton Mifflin .