Chronological observation of gonadal sex
differentiation revealed that elongated aggregations of somatic cells had been displayed in ovaries as early as 30 dph (total length 14.
Gonadal steroid hormones: major regulators of gonadal sex
differentiation and gametogenesis in fish.
In other studies, children who were reared as a sex opposite to their chromosomal and/or gonadal sex
expressed a gender identity corresponding to their assigned sexes.
Analysis of the gonadal sex
of five intersex pigs using Y chromosomal markers.
Museum specimens from throughout Illinois (Figure 1) were examined to compare cricket frog gonadal sex
in three regions of the state during five time periods.
Ovarian aromatase and estrogens: a pivotal role for gonadal sex
differentiation and sex change in fish.
It would be more accurate to describe these fish as simply showing undetermined gonadal sex
rather than assigning female status.
Congruence between secondary sex characteristics and gonadal sex
declined in a concentration-dependent manner in the male and female medaka (Figure 8).
reversal caused by PCBs has been demonstrated in turtles (Bergeron et al.
Although the outcome of the gonadal sex
did not appear to be affected by these relatively rapid changes in SF-1 protein expression, the long-term affects of this disrupted pattern of SF-1 availability might lead to later anomalies in amphibian reproductive development.
After exposure for 29 days post hatching (DPH), fish were allowed to grow until 103 and 179 DPH, at which time their genetic sex was determined using Y-chromosomal DNA markers and their gonadal sex
was determined by histology.
In addition to the effects on secondary sex characters, androgens (and estrogens) can direct gonadal sex
toward male (or female) development in many fish species if applied at a critical time at or just before the onset of gonadal differentiation (18).