title: Genetic control of the secondary sex ratio.
authors.forename: M E
authors.initials: ME
authors.lastname: Bernstein
mesh_terms: D000818:Animals; D005260:Female; D005306:Fertilization; D005823:Genetics; D006801:Humans; D008297:Male; D008597:Menstrual Cycle; D011247:Pregnancy; D051381:Rats; D012744:Sex Ratio; D013997:Time Factors