If we wanted to transfer a single resistance gene from a wild variety, by TRADITIONAL BREEDING we would also transfer many unwanted genes with the initial cross. We could try to reduce the number of unwanted genes by back crossing several times. Genes are also inherited in blocks and therefore the desired gene may be linked to an unwanted trait. In contrast, genetic engineering allows us to specifically identify and precisely transfer that one desired gene. Genetic transfer need not involve the transfer of genes between completely unrelated plants, insects or animals, but may only involve the transfer of genes within the same species or closely related members in the cereal family.
How are GM foods made?
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