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The new mexico whiptail reproduces purely through parthenogenesis. The species itself originates as a hybrid of two other species of whiptail, but the hybridization can't make fertile males. The females can reproduce through parthenogenesis so that's how the species continues to exist. So 100% of the genome is passed mother to daughter for many generations, ...


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Is there any species (not just mammals) where most, or even all, of the genome is inherited in a sex-specific trajectory? If all the genome is passed on by only one sex, then the other sex will necessarily disappear (in absence of social reasons) (and the species may go extinct if the presence of this other sex is necessary). However some cases such as ...


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In birds and reptiles females are the heterogametic sex with allosome configuration ZW. However it has been reported that a homogametic WW female boa was born by parthenogenesis. So it means that although W is shorter than Z, it can still support life. So I guess that ZW system in general exchanges more sex-limited genetic material than XY system. Platypus ...


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I want to clear up something the other answer omit. It doesn't matter how much the comparative differences are between the oxy levels of men and women. This is because we are basically two entirely different subspecies concerning our neurology. The effects of biochemistry on each system are going to be significantly different.


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Could not fit in a comment… I don't quite know how to answer. I think that the only answer one could give is why not?. Various mechanisms may evolve under different life-history, different environment, different ecological strategy, different mutations occuring,.. In some species (including some amphibians) the evolution of sex determination system is ...


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Does Oxytocin increase more so for women than for men after sex? Answer: Yes, Oxytocin level shoot up for female after sexual. It is highest at orgasm, which is the main cause women could have multiple orgasm. Someone told me that it increases 4-fold for men and 12-fold for women (unconfirmed). Answer: The level of oxytocin actually increase 5 ...



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