Most of this study describes the biochemical composition of fully ripe red tomato fruits from transgenic tomato plants and comparison of its nutritional quality with those from wild type. Studies concerning the changes that occur in fruits and its physico-chemical characteristics show that tomato fruits from transgenics were slightly smaller, more in number with comparatively more red (in web version) fruits upon maturity as compared to wild type (Fig. 1). There were no statistical differences between pH values of the tomato samples from transgenics and wild type plants. The total soluble solids (Table 1) increased in tomatoes from 4% to 6% in transgenics which was in accordance with the reports of Cemeroglu (2004) who showed that the TSS of tomato ranged from 5% to 7% depending upon tomato variety. In our study, the tomato fruits from BcZAT12-transformed tomato plants exhibited a higher sugar concentration. This could be possibly due to small fruit size that tend to have less water in the cells resulting in increased concen- tration of sugar as suggested by Stevens. A progressive in- crease in sugar content during the development of tomato fruits in transformed tomato plants has been reported throughout matu- ration and ripening.