title: Letter: Zygosity and Weinberg's rule.
mesh_terms: D005260:Female; D005306:Fertilization; D005828:Genetics, Population; D006801:Humans; D007198:Indians, North American; D008297:Male; D008433:Mathematics; D009549:Nigeria; D010063:Ovum; D010920:Placenta; D011247:Pregnancy; D014427:Twins; D014481:United States; D044465:White People