title: Variation in chiasma frequency in Cepaea nemoralis.
mesh_terms: D000818:Animals; D002875:Chromosomes; D003434:Crossing Over, Genetic; D005260:Female; D008040:Genetic Linkage; D014644:Genetic Variation; D008297:Male; D008540:Meiosis; D010858:Pigmentation; D011110:Polymorphism, Genetic; D012908:Snails / Q000254:growth & development