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However, whether this increase is the direct cause of sex reversal is unknown. Vajda and his colleagues are now looking to tie the gender bending of fish to particular pollutants and to find out whether the extra downstream females are the products of a selective die-off of males or a pollutant-triggered sex reversal. Grober makes a compelling case for the usefulness of fish in understanding mammalian sexuality, noting that in both wrasses and primates individuals are sensitive to social status, social status and increased population density affects reproduction through stress, multiple phenotypes are present within a sex, environmental variation generates variation in the social system, brain structures are correlated with variation in sexual phenotype, and complete behavioral sex reversal takes place. |
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