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Neither [4] [5] Neurogender [39] [40] [41] Neutrois [4] [5] non-binary [9] [5] can be defined as "does not subscribe to the gender binary but identifies with neither, both, or beyond male and female". [20] The term may be used as "an umbrella term, encompassing several gender identities, including intergender, agender, xenogender, genderfluid ...
The Descent of Man, and Selection in Relation to Sex is a book by English naturalist Charles Darwin, first published in 1871, which applies evolutionary theory to human evolution, and details his theory of sexual selection, a form of biological adaptation distinct from, yet interconnected with, natural selection.
Here's a guide to gender identity terms, whether you’re looking to define your personal identity or want to be a better ally. Your Gender Identity Can Change Over Time, And Yes, That’s Totally ...
In this way, our gender identity (the conviction of belonging to the male or female gender) and sexual orientation are programmed or organized into our brain structures when we are still in the womb. There is no indication that social environment after birth has an effect on gender identity or sexual orientation." [78]
Gender identity is the personal sense of one's own gender. [1] Gender identity can correlate with a person's assigned sex or can differ from it. In most individuals, the various biological determinants of sex are congruent and consistent with the individual's gender identity. [2]
A form of complete gonadal dysgenesis, mostly due to mutations in the first step of sex determination; the SRY genes. A 5-alpha-reductase deficiency results in atypical development characterized by female phenotype or undervirilized male phenotype with development of the epididymis , vas deferens , seminal vesicle , and ejaculatory duct , but ...
Sexual selection creates colourful differences between sexes in Goldie's bird-of-paradise.Male above; female below. Painting by John Gerrard Keulemans.. Sexual selection is a mechanism of evolution in which members of one sex choose mates of the other sex to mate with (intersexual selection), and compete with members of the same sex for access to members of the opposite sex (intrasexual ...
In humans, barring intersex conditions causing aneuploidy and other unusual states, it is the male that is heterogametic, with XY sex chromosomes.. Haldane's rule is an observation about the early stage of speciation, formulated in 1922 by the British evolutionary biologist J. B. S. Haldane, that states that if — in a species hybrid — only one sex is inviable or sterile, that sex is more ...