thus r.f . can be increased even before the cells are fully committed to meiosis.-a 3-h heat treatment at the beginning of s phase ( or 8 h before karyogamy ) also causes some ( 30 % ) increase in r.f . while the same treatment at late s phase ( or 3 h before karyogamy ) causes a substantial ( 164 % ) increase in r.f . over the controls .
C0007634
cells
C0080129
s phase