A search for linkage between genes for albinism and parathion resistance inTetranychus Pacificus McGregor

The inheritance of resistance to parathion in the Pacific spider mite was investigated by means of a backcross. A 1:1 ratio of a susceptible and a resistant class indicated the existence of a single dominant gene for resistance.Since the susceptible parental strain was marked with a recessive for albinism, information was obtained of the genetic relationship between the gene for resistance (R _p ) and the gene for albinism (p). The segregation of resistant (R _p r _p ) and susceptible (r _p r_p) classes in pigmented (p+p) and albino (pp) animals revealed that there was no linkage between these genes.