title: Letter: Observations on "a re-examination of the heritability of fertility in the British peerage," by Williams and Williams.
mesh_terms: D000483:Alleles; D004739:England; D005260:Female; D005298:Fertility; D014644:Genetic Variation; D006801:Humans; D008297:Male; D010641:Phenotype; D012641:Selection, Genetic; D012923:Social Class