Biology differentiation genetic marker reproductive sex
Materials and Methods
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Sexual differentiation in humans is the process of development of sex differences in humans. The presence of the SRY gene on the Y chromosome causes the In humans, biological sex is determined by five factors present at birth: the determined because the reproductive structures do not differentiate until the seventh.
Description:Abstract Teleost fishes are the most species-rich clade of vertebrates and feature an overwhelming diversity of sex-determining mechanisms, classically grouped into environmental and genetic systems. Here, we review the recent findings in the field of sex determination in fish. In the past few years, several new master regulators of sex determination and other factors involved in sexual development have been discovered in teleosts. These data point toward a greater genetic plasticity in generating the male and female sex than previously appreciated and implicate novel gene pathways in the initial regulation of the sexual fate. Overall, it seems that sex determination in fish does not resort to a single genetic cascade but is rather regulated along a continuum of environmental and heritable factors. IN contrast to mammals and birds, cold-blooded vertebrates, and among them teleost fishes in particular, show a variety of strategies for sexual reproduction Figure 1 , ranging from unisexuality all-female species to hermaphroditism sequential, serial, and simultaneous, including outcrossing and selfing species to gonochorism two separate sexes at all life stages.
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