Biology 1201A Study Guide - Midterm Guide: Transposable Element, Gene Duplication, Reverse Transcriptase
Document Summary
Mobile elements (transposable elements) segments of dna that move from one place to a(cid:374)othe(cid:396) & (cid:272)ut & paste se(cid:272)tio(cid:374)s of dna usi(cid:374)g (cid:396)e(cid:272)o(cid:373)(cid:271)i(cid:374)atio(cid:374) that does(cid:374)(cid:859)t (cid:396)e(cid:395)ui(cid:396)e homology. Transposition mechanism of movement, involving nonhomologous recombination of mobile elements (transposable elements (tes) which cause genetic changes). Tes biological mutagens that increase genetic variability. Inverted repeat at 2 ends of is; enables transposase to identify the ends of the te when it catalyzes transposition & provides transposase for movement of element in transposon. Eukaryotic tes have 2 major classes: (distinguished by their movement: copy paste retrotransposons: transposition occurs via an intermediate. Rna copy of the te: retrotransposon (dna element) is transcribed into a complementary rna copy. Retroviruses when it infects a host cell, a reverse transcriptase carried in the virus particle is released & copies the ss rna genome in to a ds dna copy.
