The evolutionary implications of mobile genetic elements.

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The Evolutionary Hypotheses . .. . . . .. . . . .. . . ..... . . . . . . . . . ........ . . . .. . ....... . . .... . ... . .. . . . . General Considerations .. . . .............. . . . ....... ........ . ... . . . . . ...... . ............ . . . . . . ... . BACTERIAL INSERTION SEQUENCES ..................................................... . . Self-Regulation of ISJO and IS50 Movement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The Effect of IS Insertion on Gene Expression ............................................ . . Growth Competition Experiments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TRANSPOSONS IN yEAST ...................................................................... .