Goiter 发表于 2025-3-21 18:22:26
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,It’s a Boy! Evidence for Sex Ratio Adjustment in Humans,ment of practices or methods to control it. While the overall natal ratio of boys to girls produced by humans hovers at a stable 1.06 boys for every girl, there is now evidence that these sex ratios vary substantially among populations, in response to severe life events, in conjunction with the posi任意 发表于 2025-3-22 02:19:53
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The Bees Do It, but What About the Birds? Evidence for Sex Ratio Adjustment in Birds,the egg. There is now a large body of evidence that female birds can adjust which sex chromosome the eggs receive in response to the social and/or environmental conditions surrounding them. In this chapter, I highlight the many factors that have been shown to influence avian sex ratios and highlight斜 发表于 2025-3-22 14:38:17
Potential Mechanisms of Sex Ratio Adjustment in Birds,ditions. Since birds exhibit a strictly genetic system of sex determination, the precise mechanisms by which this may occur remain unclear. There is now evidence that birds of some species may be able to influence the process of meiosis to control which sex chromosome is retained in the oocyte and w斜 发表于 2025-3-22 19:33:10
Hormones Rule the Roost: Hormonal Influences on Sex Ratio Adjustment in Birds and Mammals,s and that, in each group, there are several mechanistic targets at which such manipulation of offspring sex may occur. What we still don’t know, however, is how those environmental and social conditions are transduced into physiological signals that will ultimately influence the process of sex detehazard 发表于 2025-3-23 00:57:14
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,The Truth About Nemo’s Dad: Sex-Changing Behaviors in Fishes,by which this may occur. In fishes, there is virtually no evidence showing parental manipulation of sex ratios, perhaps because many fish species exhibit a higher level of plasticity within their sex-determining systems. We now know that fish exhibit the most diverse range of sex-determining systems集合 发表于 2025-3-23 08:23:20
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