Electrophoretic analysis of a chromosomal hybrid zone in the grasshopper Podisma pedestris

摘要: We have made an extensive allozyme survey of 21 enzyme and protein loci in populations the alpine grasshopper Podisma pedestris. This species occurs two races, differing by a chromosomal fusion which separates ancestral XO/XX race from derived neo-XY race. These races also differ DNA content, hybrids between them reduced viability. Electrophoresis reveals that amount genetic differentiation these is no greater than variation among within each Both larger-scale surveys detailed area where hybridize, show change not correlated with gene frequency changes at any studied. findings are consistent recently developed theory concerning strength barrier to flow posed hybrid zone characteristics such as those measured experimentally Podisma. It argued zones other involve allozymic differences do so because stronger selection against rather through mating isolation.