Selected Examples of Variations in Sexual Differentiation. Advertising [x] 15 At Conception Conception means the point when a sperm and an egg meet and the egg is fertilized. On the other hand, adolescence is a more general and gradual coming of age that transpires during most of the second decade of life. Although you can't feel his movements, he's all over the place at this point, arms and legs waving, body wriggling. There is a striking sexual dimorphism in the circulating concentration of leptin at birth, at which time females have higher levels than males, and again in late puberty and adulthood. Sex organs vary in shape and size and sex chromosomes can vary as well. It helps in the process of the production of sperm spermatogenesis. Complete differentiation of the external genitalia and urogenital sinus in males occurs only if the androgen stimulus is received during the critical period of development. In female development, proliferation of the vesicovaginal septum pushes the vaginal orifice posteriorally so that it acquires a separate external opening; thus, no urogenital sinus as such is preserved.
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