title: Inter-population sex chromosome polymorphism in the grasshopper Podisma pedestris. I. Fundamental facts.
mesh_terms: D000818:Animals; D005075:Biological Evolution; D003434:Crossing Over, Genetic; D005260:Female; D007313:Insecta; D008297:Male; D011110:Polymorphism, Genetic; D012730:Sex Chromosomes; D012744:Sex Ratio