title: Variation of the human secondary sex ratio and lethal recessive X-linked mutations.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D005260:Female; D005804:Genes, Lethal; D005808:Genes, Recessive; D008040:Genetic Linkage; D006801:Humans; D007558:Italy; D008297:Male; D008875:Middle Aged; D012729:Sex Chromosome Aberrations / Q000235:genetics* / Q000401:mortality; D012744:Sex Ratio; D014960:X Chromosome