Concept 19.4: Eukaryotic Genomes canhave many noncoding DNA sequences in addition to genes WILL S., MICHELLE K., REX L., MAYA H.
Remember Transposable Elements? Chapter 18: nucleic acid segments, PROKARYOTES recombination (movement) within genome Chapter 19: EUKARYOTES 1940s – 1950s Barbara McClintock Bred corn Different kernel colors
What are Transposons and Retrotransposons? Eukaryote Transposons 2 types: Transposons: transposable elements move using DNA intermediate Retrotransposons: transposable elements move using RNA intermediate (transcript of the retrotransposon DNA)
How do these Transposons Move? Cut & Paste Copy & Paste RNA = ALWAYS Copy & Paste RNA intermediate made Reverse transcriptase transposon copy Insertion new place Evolutionary Advantage
Sequences Related to Transposable Elements Many copies Some similar some not Some move some can’t Move through enzymes Make up large part of genome Alu elements – 10% human genome Codes for RNA molecules Most transposable elements = “noncoding” DNA
Is there an animation to simplify all of these words? Yes! (that may have been overenthusiastic)