title: Timing of fertilization and sex ratio of offspring--a review.
abstract: Evidence is reviewed for the hypothesis that there is a causal connection between the time of fertilization within the menstrual cycle and the sex of the resulting zygote.
mesh_terms: D000818:Animals; D003075:Coitus; D005260:Female; D005306:Fertilization; D006801:Humans; D007314:Insemination; D008297:Male; D008393:Marriage; D008433:Mathematics; D008598:Menstruation; D051379:Mice; D008962:Models, Theoretical; D011247:Pregnancy; D012744:Sex Ratio; D013997:Time Factors; D014429:Twins, Dizygotic; D014857:Warfare; D015053:Zygote