RADIATION ANALYSIS OF A LECANOID GENETIC SYSTEM

Abstract

I N 1921, SCHRADER first reported the unusual cytological system in a mealy bug Pseudococcus nipae (Mask.). Further work by SCHRADER (1923a) and These and other studies are discussed in HUGHES-SCHRADER'S ( 1948) comprehensive review of coccid cytology. One set of chromosomes undergoes facultative heterochromatization in male embryos and becomes excluded from the genetic continuum at spermatogenesis.