What naturally occurring substances were used to change the dna of the corn in order to make resistant to the corn borer pest ?

The special gene of interest that was inserted into it is called a transgene. The gene from Bacillus thuringiensis that produces the crystal toxin protein has been inserted into the D.N.A. of the corn and therefore making it poisonous to insects.

Explanation:

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this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.