title: Chiasma frequency and maternal age in mammals.
mesh_terms: D000818:Animals; D002875:Chromosomes; D004314:Down Syndrome / Q000235:genetics; D005260:Female; D005787:Gene Frequency; D006801:Humans; D007246:Infertility; D008297:Male; D008423:Maternal Age; D051379:Mice; D008938:Mitosis; D010063:Ovum / Q000166:cytology*; D011247:Pregnancy; D013223:Statistics as Topic