| Popis: |
The ability of the double heterozygous mutant a 1 + / a 1 a 2 + / a 2 (greenish-yellow) to revert phenotypically towards green was used to quantify the dose-response relationship at 0, 8, 16, 32, 64, 128 and 256 R of gamma-rays from a 60 Co-source. All the studies undertaken up to now on the genetic nature of the events responsible for the phenotypic reversion suggest that the changes take place mostly at locus a 1 + − a 1 . The present experiment was split into two parts: a low-dose (0–64 R) and a higher-dose (64–256 R) analysis, in which the responses were quadratic and linear, respectively. The spontaneous reversion rate was estimated to be 10 −5 . |
