Answer:
No radiation treatment has been used to
create thousands of new plant varieties. These varieties are cultivated as food
and feed. Radiation is known to be much more disruptive for chromosomal
structure than the manipulations used to make transgenic plants.
Such radiation treatment of crop plants
has caused no documented instances of ill-health among consumers despite having
been used commercially for several decades.
For rice crops alone, hundreds
of different mutant varieties have been developed mostly made by using ionizing
radiations, like gamma rays.
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