Study of maternal effects from human twin families.
D005260:Female; D005826:Genetics, Medical; D006801:Humans; D008297:Male; D008433:Mathematics; D008957:Models, Genetic; D009034:Mother-Child Relations; D010641:Phenotype; D011247:Pregnancy; D012737:Sex Factors; D014427:Twins; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic