__ uses biological and chemical methods to change the dna sequence of genes. a. recombinant dna b. genetic engineering c. gene therapy d. selective breeding question 3 of 5 involves placing a normal allele in a cell tha has a mutation and hoping that the normal allele begins to function. a. chemical engineering b. selective breeeding c. recombinant dna d. gene therapy question 4 of 5 many stores genetically engineered produce. a. provide pamphlets on b. refuse to sell c. label d. carry only question 5 of 5 gene therapy has shown promise in controlling extra content ↵ a. high blood pressure b. the common cold c. cystic fibrosis d. multiple sclerosis save save and complete later save and complete assignment 1 of