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Fig. 8. A model for the relationship between retn and fru
functions in male behavior. (A) In the absence of retn or
fru functions, there is an intrinsic tendency towards development of
neural circuitry leading to male-like courtship. In situations in which
retn and the fruM products are absent, such as in
retn mutant females, this will be revealed as some degree of
male-like courtship behavior. (B) The retn products normally act to
counter the tendency towards male-like behaviors such that wild-type females
do not show male-like behavior. (C) In wild-type males, retn is still
active as a repressor, but the presence of fruM product substantially
enhances development of the male behavior pathway, such that the male behavior
pathway overcomes the negative effect of retn function.
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