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(Solved): 28. An allelic exchange using homologous cross-overs, e.g. replacing a mutant gene with a wt allele ...
28. An allelic exchange using homologous cross-overs, e.g. replacing a mutant gene with a wt allele or vice versa, requires cross-over(s). a. no b. 1 c. 2 d. 3 e. a variable number depending on the size of the target fragment