“…Interspecific variations in both chiasma frequency and chiasma distribution have been extensively studied and described (e.g., John and Lewis, 1965), but there have been relatively many fewer studies of intraspecific chiasma variation. Significant levels of chiasma frequency variation have been previously reported between populations of Melandrium (Lawrence, 1963), Lolium perenne, L. italicum and Festuca pratensis (Rees and Ahmad, 1963;Rees and Dale, 1974), Chorthippus parailelus, Omocestus viridulus and Myrmeleotettix maculatus (Hewitt, 1965) Phaulacridium marginale (Westerman and Fontana, 1973), Metrioptera brachyptera (Southern, 1968), Triticum ion gissimum (Zarchi et. al., 1972) and Cepaea nemoralis and C. hortensis (Price, 1974(Price, , 1975.…”