Biology Reference
In-Depth Information
Fig. 56.
Proposed ontrogenetic pathways of sex determination and differentiation in mammals
(as reported by Le Page et al., 2010, fi rst panel) and the presently proposed pathways for
primary gonochoric fi shes (second panel) and secondary gonochoric and hermaphroditic
fi shes (third panel). J = juvenile stage, P = puberty, M = sexual maturity, SC = sex change in
sequential hermaphrodites, SSC = sex change in serial hermaphrodites
the so called labile period (Pandian and Sheela, 1995). Firstly all the
reported morphotypes undergo ontogenetic change from one morphotype
to another but all within one sex namely the male, clearly indicating that
the brains of these morphotypes are at least partially sexualized. Secondly,
a series of experiments by Yoshizaki and his team has established that
bisexual potency of the PGCs, OSCs and SSCs, drawn from mature fi shes
that have already spawned/milted, express bisexual potency only in the
