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bold). And its expression results in two different cells or main programs, each
expressing different genes in different ways (Figure 2.8). And as you can see
in Figure 2.8, in this particular case, ADF
0
is called both from Cell
0
and Cell
1
;
ADF
1
is called twice from Cell
0
and just once from Cell
1
; and ADF
2
is only
called from Cell
1
.
The applications of these multicellular systems are multiple and varied
and, like the multigenic systems, they can be used both in problems with just
one output and in problems with multiple outputs. In the former case, the
best program or cell accounts for the fitness of the individual; in the latter,
each cell is responsible for a particular facet of a multiple output task such as
a classification task with multiple classes. We will pursue these questions
further in chapter 6, where automatically defined functions are discussed in
more detail.
a.
012345601012345601012345601
/Q+*babab/+a/abbab*Q-bbaaab
01234560123456
*1+1020*Q*1202
b.
ADF
0
ADF
1
ADF
2
/
a
Q
Q
a
a
a
b
/
b
b
a
b
b
b
c.
Cell
0
Cell
1
ADF
1
Q
ADF
1
ADF
2
ADF
0
ADF
1
ADF
0
Figure 2.8.
Expression of chromosomes with two homeotic genes encoding two
different main programs or cells.
a)
The chromosome composed of three conven-
tional genes and two homeotic genes (shown in bold).
b)
The sub-ETs or ADFs
codified by each conventional gene.
c)
Two different main programs expressed in
two different cells. Note how different cells put together different consortiums of
genes.
