“…Genetic distance between this line and D. heteroneura mtDNA restriction endonuclease data has recently been applied to the population genetics of humans and apes (Brown, 1980;Cann et a!., 1982;Ferris et al, 1981), lizards (Brown and Wright, 1979), rodents (Lansman et a!., 1981;Brown and Simpson, 1981;Ferris et al, 1983;Avise et al, 1983) and Drosophila (Shah and Langley, 1979;Powell, 1983;Powell and Zuniga, 1983). Vertebrate mtDNA is relatively easy to analyse as it is available in relatively large amounts per individual (Giles et aL, 1980;Lansman et a!., 1981;Ferris et al, 1983). As Powell (1983) points out, however, mtDNA restriction techniques in Drosophila systems usually demands that isofemale lines are used to obtain enough tissue to isolate mtDNA.…”