Biology 2581B Lecture Notes - Lecture 21: Canola, Patau Syndrome, Edwards Syndrome
13 Oct 2017
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Document Summary
Transposable elements: transposable elements = jumping genes, coloring of kernels due to transposons, discovered by barbara mcclintock in maize, first evidence by marcus roades in 1930s and described in detail in detail by barbara. Mcclintock in maize from 1940 onwards but they exist in many organism including mammals, insects, plants. Two different major classes, move from dna to dna: retrotransposons, retroposns, transpose via reverse transcription of an rna intermediate, transposons, transpose dna directly without an rna intermediate. Transposable elements: many different types of transposons within an individual or between species, some with cool names: mariner, gypsy, looper, springer, hopper, stalker, invader, diver, frogger. Can be 50 bp to 10 kb in length, differs by a lot (large range) Different copy numbers: one to 100 thousands of the particular type within genome. Have an impact on: evolution of genome, genome size and structure, gene expression. Ltr retrotransposons copia from drosophila: transposable elements in drosophila.
