Information Technology Reference
In-Depth Information
0123456789012345678901234567890
*b+a-
+
Qab+//+b+
babbabbbababbaaa
(2.7)
And its expression results in the following ET:
b
a
Q
a
b
/
/
b
b
a
a
b
b
In this case, the termination point shifts 12 positions to the right (position 19),
enlarging significantly the new expression tree.
Obviously the opposite might also happen, and the expression tree might
shrink. For instance, suppose that a mutation occurred at position 2 in chro-
mosome (2.5) above, changing the “+” into “Q”:
0123456789012345678901234567890
*b
Q
a-aQab+//+b+
babbabbbababbaaa
(2.8)
Now its expression results in the following ET:
b
Q
a
In this case, the ORF ends at position 3, shortening the original ET in four
nodes and creating a new daughter tree very different from the original one.
So, despite their fixed length, each gene has the potential to code for ex-
pression trees of different sizes and shapes, being the simplest composed of
