1. Concept 19.4: Eukaryotic Genomes can
have many noncoding DNA sequences in
addition to genes
WILL S., MICHELLE K., REX L., MAYA H.

2. 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

3. 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)

4. 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

5. 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

6. Is there an animation to simplify all of these
words?
Yes!
(that may have been overenthusiastic)