- Effects of sexual differences of age at maturity and survival on population sex ratio Pieau, C.; Girondot, M. // Evolutionary Ecology;Nov1993, Vol. 7 Issue 6, p645
No abstract available.
- Is canada's sex ratio in decline? Dodds, Linda; Armson, B.A. // CMAJ: Canadian Medical Association Journal;01/01/97, Vol. 156 Issue 1, p46
Editorial. Comments on the study of declining sex ratio in Canada conducted by Dr. Bruce B. Allan. Influencing factors; Significance of the increasing use of ovulation induction; Tendency for the sex ratio to stabilize.
- Secular trends in sex ratios at birth in North America and Europe over the second half of the 20th century. Grech V; Vassallo-Agius P; Savona-Ventura C // Journal of Epidemiology & Community Health;Aug2003, Vol. 57 Issue 8, p612
CONTEXT: A previous study showed that significantly more boys were born in southern latitudes in Europe than in northern latitudes and the converse pattern was observed in North America. OBJECTIVE: This study analyses secular trends in gender ratios for live births over the second half of the...
- Sex ratio and selection by early mortality in humans: Fifty-year analysis in different ethnic... Ulizzi, L.; Zonta, L.A. // Human Biology;Dec94, Vol. 66 Issue 6, p1037
Studies the sex ratio in representative populations of the main human ethnic groups. Sex ratio values in live borns; Early mortality; Natural selection.
- Early selection and sex composition in Italy: A study at... Zonta, L.A.; Astolfi, P. // Human Biology;Jun96, Vol. 68 Issue 3, p415
Presents a study on the influences of socioeconomic, cultural, and biological factors on early selection and sex ratio in Italy. Materials and methods used in study; Sex ratio secular trend; Rate of fertility in Italy; Stillbirth rates; Factors which influence sex composition at birth.
- An inclusive fitness model for the sex ratio in a partially sibmating population with inbreeding cost Taylor, P. D.; Denver, K. // Evolutionary Ecology;May1995, Vol. 9 Issue 3, p318
No abstract available.
- Killing the sex ratio. Judson, Olivia P. // Nature;12/8/1994, Vol. 372 Issue 6506, p503
Reports on the results of a paper authored by J. Kumm, K.N. Laland and M.W. Feldman and published in the `Theoretical Population Biology' periodical, modelling the interaction between cultural bias and the genetics of human sex ratios. Practice of infanticide by diverse cultures; Social costs of...
- Why presidents have more sons. Ridley, Matt // New Scientist;12/3/94, Vol. 144 Issue 1954, p28
Examines the possible explanations behind the phenomenon of non-random sex ratios at birth. Evidence for non-random sex ratios; Coital-frequency theory proposed by John Martin; Hormonal theory proposed by William James; Adaptive design theory proposed by Robert Trivers and Dan Willard; Link...
- Why presidents have more sons. Riley, Matt // Bulletin with Newsweek;2/14/95, Vol. 116 Issue 5957, p46
Discusses theories on non-random sex ratios at birth. Effects of speed of Y sperm and endurance of X sperm; Promotion of conception of boys by testosterone and estrogens; Adaptive design in sex selection.