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In _____ _____, only animals with desired characteristics are allowed to produce the next generation. selective breeding Crossing dissimilar individuals to bring together the best of both organisms is called _____. hybridization The continued breeding of individuals with similar characteristics is called _____. inbreeding Biologists change the DNA code of a living organism through _____ _____. genetic engineering A _____ _____ cuts DNA at a specific sequence of nucleotides. restriction enzyme DNA fragments can be separated and analyzed by _____ _____. gel electrophoresis DNA molecules that are produced by combining DNA from different sources are called _____ _____. recombinant DNA A technique known as _____ is used to make many copies of a single gene. PCR A gene for antibiotic resistance may be used as a _____ _____, making it possible to identify a transformed cell. genetic marker A _____ organism contains genes from another species. transgenic A _____ is a member of a population of genetically identical cells produced from a single cell. clone