MODEL RELEASED. Genetically modified crops. Researcher comparing the growth of genetically modified sugar beet plants (Beta vulgaris) with that of normal rape plants (Brassica napus). The beet plants (pale green) are seen growing healthily beside the withered rape (darker green, growing in patches). This field has been sprayed with a weedkiller. Modification of the beet's DNA (deoxyribonucleic acid) has given it resistance to the weedkiller, while the rape has no such protection. Altering DNA, which contains the genetic code, may be used to impart many beneficial properties to crops. Photographed in Kings Lynn, England. (KEYSTONE/SCIENCE PHOTO LIBRARY/CHRIS KNAPTON)
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