ChromosomesHumansDrosophilaSpeciation ModelSingle IndividualHumanParapatricSympatric PopulationGameteHeterozygous ChromosomeChromosome RegionColinear ChromosomeDrosophila Speciesspeciationchromosomemutationrearrangementchromosome rearrangementpopulation of a chromosome rearrangementdisable difficultymodel encounterlow reproductive fitnessdysfunctional gametechromosome rearrangement produceheterozygous chromosome rearrangement producehybrid-dysfunctionchromosome speciationsympatricparapatricchromosome rearrangement actspeciation pointmodel of speciation pointsuppressed-recombination