Hybrid Vigor-a Factor in Tettigid Parthenogenesis?

Abstract

Partheno-reproducing lines of Tettigidae descended from hybrid $$ may continue to be heterozygous, since, on account of pre-synapsis splitting, there are four strands in each tetrad concerned in crossing-over and with this the giving off of but one polar body. If hybrid vigor, through heterozygosis, may be expressed in parthenogenesis, it should continue, though in diminishing amount, as homozygosis is approached.