title: A model for quantifying genetic recombination in chromosome polymorphisms due to supernumerary heterochromatic segments.
abstract: Heterochromatic supernumerary segments can modify chiasma distribution in the affected bivalents. A model is developed for quantifying the genetic recombination in populations polymorphic for such segments. This paper describes this model for a monochiasmate bivalent, and its application in different populations of the grasshopper Chorthippus parallelus. The observations suggest that these polymorphic systems have evolutionary implications.
mesh_terms: D000818:Animals; D002875:Chromosomes / Q000502:physiology*; D006110:Grasshoppers / Q000235:genetics; D006570:Heterochromatin / Q000502:physiology*; D006720:Homozygote; D008957:Models, Genetic; D011110:Polymorphism, Genetic; D011995:Recombination, Genetic
chemical_list: D006570:Heterochromatin