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Most mammals, including humans, have an XY sex-determination system: the Y chromosome carries factors responsible for triggering male development. In the absence of a Y chromosome, the fetus will undergo female development. This is because of the presence of the sex-determining region of the Y chromosome, also known as the SRY gene. [5]
Sexual differentiation is the process of development of the sex differences between males and females from an undifferentiated zygote. [1] [2] Sex determination is often distinct from sex differentiation; sex determination is the designation for the development stage towards either male or female, while sex differentiation is the pathway towards the development of the phenotype.
[7] [11] In the 21st century, the noun female is primarily used to describe non-human animals, to refer to biologically female humans in an impersonal technical context (e.g., "Females were more likely than males to develop an autoimmune disease"), or to impartially include a range of people without reference to age (e.g., girls) or social ...
Some snarky online personalities have joked that by this definition, everyone in the U.S. is now female by default. Others noted that the new rule could be interpreted to mean that no one has a ...
Along with using the gender binary to categorize human bodies, cultures that obey the binary may also use it to label things, places, and ideas. For example, in American culture, people identify playing sports as a masculine activity and shopping as a feminine activity; blue is a color for boys while pink is for girls; care work is a feminine ...
President Trump will on his first day in office Monday issue an order defining a person's sex as "male or female" — requiring government agencies to use the "immutable" designation on forms and ...
Sex differences in human physiology are distinctions of physiological characteristics associated with either male or female humans. These can be of several types, including direct and indirect, direct being the direct result of differences prescribed by the Y-chromosome (due to the SRY gene ), and indirect being characteristics influenced ...
The executive order declares there are only "two sexes, male and female" and defines a "female" as "a person belonging, at conception, to the sex that produces the large reproductive cell."