title: Evaluation of the discrepancy between primary and secondary sex ratios.
mesh_terms: D000032:Abortion, Therapeutic; D005260:Female; D005453:Fluorescence; D006801:Humans; D008297:Male; D010920:Placenta / Q000033:anatomy & histology; D011247:Pregnancy; D012728:Sex Chromatin; D012730:Sex Chromosomes; D012744:Sex Ratio