Information Technology Reference
In-Depth Information
c.
dA:
Sub-ET
1
Sub-ET
2
A
A
c
O
b
A
c
a
c
A
a
c
dB:
Sub-ET
1
Sub-ET
2
N
A
c
A
O
c
a
c
A
c
b
Figure 3.25.
Continued.
somes crossed over point 1 (between positions 0 and 1) of gene 1, exchang-
ing part of gene 1 and the entire gene 2.
The expression of these four chromosomes (parents and progeny) shows
how profound the effects of one-point recombination can be. In this case, the
first gene was split immediately after the start position, drastically reshaping
the sub-ETs, whereas the second gene was left undisturbed. One of the newly
created individuals (chromosome 6 of generation 13) is as mediocre as the
worse of its progenitors (chromosome 6 of generation 12); the other (chro-
mosome 1 of generation 13) is better than its parents and is, in fact, a perfect
solution to the problem at hand.
It is worth emphasizing that GEP chromosomes can cross over any point
in the genome, continually disrupting old building blocks and continually
forming new ones. Furthermore, due to both the multigenic nature of GEP
chromosomes and the existence of noncoding regions in most genes, entire
genes and intact ORFs can be swapped between recombining chromosomes.
Thus, the disruptive tendencies of one-point recombination (splitting of
building blocks) coexist side by side with its more conservative tendencies
