title: Selective advantage of fra (X) heterozygotes compared with mothers of Down syndrome probands?
authors.forename: P H
authors.initials: PH
authors.lastname: Jongbloet
mesh_terms: D004314:Down Syndrome / Q000235:genetics / Q000503:physiopathology*; D005260:Female; D005298:Fertility; D005600:Fragile X Syndrome / Q000235:genetics / Q000503:physiopathology*; D006579:Heterozygote; D006801:Humans; D009035:Mothers; D011247:Pregnancy