Abstract
Decreasing frequency of coitus accompanying advancing age and prolongation of marriage, predisposing to delayed fertilization, may explain the correlation of increased incidence of mongol births with advancing maternal age.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Penrose, L. S., and Smith, G. F., Down's Anomaly (Little, Brown and Co., Boston, 1966).
Lejeune, J., Gautier, M., and Turpin, R., CR Acad. Sci., 248, 602 (1959).
Horne, H. W., and Thibault, J., Fertil. Steril., 13, 135 (1962).
Arey, L. B., Developmental Anatomy, sixth ed. (W. B. Saunders Co., Philadelphia, 1954).
Patten, B. M., Foundations of Embryology (McGraw-Hill, New York, 1958).
Marston, J. H., and Chang, M. C., J. Exp. Zool., 155, 237 (1964).
Hammond, J., J. Exp. Zool., 11, 140 (1934).
Blandau, R. J., and Young, W. C., Amer. J. Anat., 64, 303 (1939).
Chang, M. C., and Fernandez-Cano, L., Anat. Rec., 132, 307 (1958).
Austin, C. R., The Mammalian Egg (Blackwell Scientific Publications, Oxford, 1961).
Hancock, J. L., J. Reprod. Fertil., 2, 307 (1961).
Adams, C. E., and Chang, M. C., J. Exp. Zool., 151, 155 (1962).
Austin, C. R., Nature, 213, 1018 (1967).
Butcher, R. L., and Fugo, N. W., Fertil. Steril., 18, 297 (1967).
Edwards, J. H., in New Directions in Human Genetics, Birth Defects, Original Article Series, 1 (No. 2), 82 (The National Foundation, New York, 1965).
Kinsey, A. C., Pomeroy, W. B., Martin, C. E., and Gebhard, P. H., Sexual Behavior in the Human Female, 348, Fig. 63, Table 93 (W. B. Saunders Co., New York, 1953).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
GERMAN, J. Mongolism, Delayed Fertilization and Human Sexual Behaviour. Nature 217, 516–518 (1968). https://doi.org/10.1038/217516a0
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1038/217516a0
- Springer Nature Limited
This article is cited by
-
Pregnancy outcome associated with natural family planning (NFP): scientific basis and experimental design for an international cohort study
Advances in Contraception (1988)
-
Second meiotic nondisjunction is not increased in postovulatory aged murine oocytes fertilized in vitro
In Vitro Cellular & Developmental Biology (1988)
-
Alterations to the microtubular cytoskeleton and increased disorder of chromosome alignment in spontaneously ovulated mouse oocytes aged in vivo: an immunofluorescence study
Chromosoma (1986)
-
The ageing gamete in relation to birth control failures and Down syndrome
European Journal of Pediatrics (1985)
-
Relationship between congenital anomalies and contraception
Advances in Contraception (1985)