Comparative, developmental, neurobehavioral, sexual dimorphisms
Viveros et al (2012) : “…we now know that the SRY can begin directing sexual differentiation prior to onset of hormonal secretions from the fetal testes.”
We knew that more than 15 years ago. It’s great to see others catching up.
Diamond, Binstock and Kohl (1996): “It is now recognized that other genes on other chromosomes can induce sex reversal regardless of the individual’s SRY status (Bennett, Docherty, Robb, Ramani, Hawkins, and Grant, 1993; Kwok, Tyler-Smith, Mendonca, Hughes, Berkovitz, Goodfellow, and Hawkins, 1996; Schafer et al., 1995). Similarly, therefore, if specific genes or genomic regions are found to be primary determinants of sexual orientations, upstream and downstream genes are likely also to play crucial roles. And these multigene interrelationships will have profound impact upon phenotypes and judgments derived therefrom. Parenthetically it is interesting to note even the yeast Saccharomyces cerevisiae has a gene-based equivalent of sexual orientation (i.e., a-factor and alpha-factor physiologies). These differences arise from different epigenetic modifications of an otherwise identical MAT locus (Runge and Zakian, 1996; Wu and Haber, 1995).
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