SEX REVERSAL IN ANIMAL KINGDOM : SPECIAL EMPHASIS ON ROLE OF STEROID HORMONES

Sexual fate is no longer seen as an irreversible deterministic switch set during early embryonic development but ongoing battle for primacy between male and female developmental trajectories. That sexual not final must be actively maintained via continuous suppression of the opposing network creates potential flexibility into adulthood. In many Animals, sexuality only extremely plastic, sex change a usual adaptive part life cycle. Sequential hermaphrodites begin one sex, changing sometime later to other, include species capable protandrous (male- to-female), protogynous (female-to-male), or serial (bidirectional) change. Natural involves coordinated transformations across multiple biological systems, including behavioural, anatomical, neuroendocrine, molecular axes. This can caused by human pollutants, herbicides, which act estrogen promoters inhibitors, would respectively increase decrease number offspring, through controlling aromatase. review project paper highlights processes underlying this amazing transformation, Gonadal restructuring among germinal somatic cell interaction, Neuroendocrine control Stress response role Steroid hormones-balance 17beta-estradiol & 11- ketotestosterone in changes, Endocrine disruption on Changing Behaviour, remains poorly understood, where new genomic technologies are significantly advancing our understanding how initiated progressed at Hormonal levels. Knowledge usually committed process plastic sequentially hermaphroditic fishes, Amphibians Birds relevant evolution functioning systems vertebrates generally, well pathologies mammals, some time observed nematodes Gastropodes also. Keywords- change, hormones, hermaphrodism