AIIMS 2018 Zoology Hormonal Regulation MCQ Question

GnRH (Gonadotropin-Releasing Hormone) is crucial for initiating the hormonal cascade that leads to the production of sex hormones, including estrogen, which is responsible for the development of secondary sexual characteristics in females. While Estradiol (B) is indeed a key hormone in promoting these characteristics, it is not the initiating factor; rather, it is stimulated by GnRH. Estriol (C) is a weaker estrogen primarily involved in pregnancy, and Progesterone (D) plays a role in the menstrual cycle and pregnancy but does not directly initiate the development of secondary sexual traits. Understanding the hierarchy of hormone signaling is essential in grasping the regulation of sexual development.