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Chromosomal sex is determined at the time of fertilization; a chromosome from the sperm cell, either X or Y, fuses with the X chromosome in the egg cell. Gonadal sex refers to the gonads, that is the testicles or ovaries, depending on which genes are expressed. Phenotypic sex refers to the structures of the external and internal genitalia. [6]
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.
In writing, the term "Determination of sex" peaked in usage around 1910. [5] [6] The term "sex determination" increased in usage after 1900. [7]In the 1960 and early 70's the term "sex assignment" came into prominent use as a colloquially word for "determination of sex" and "sex determination".
"The sex of a human, female or male, is determined genetically at conception (fertilization), and is observable before birth," according to the guidance. ... often called gender-affirming care ...
In this system, the sex of an individual usually is determined by a pair of sex chromosomes. Typically, females have two of the same kind of sex chromosome (XX), and are called the homogametic sex. Males typically have two different kinds of sex chromosomes (XY), and are called the heterogametic sex. [1]
It requires federal departments to recognize gender as an immutable male-female binary (determined by biological sex assigned at conception) that cannot be changed, replace all instances of "gender" with "sex" in materials, cease all funding for gender-affirming care and the promotion of "gender ideology", cease allowing gender self ...
The second major issue with the new executive order is that it defines the sexes as belonging to a sex, at conception, that produces either a large or small “reproductive cell” (eggs or sperm).
A sex-determination system is a biological system that determines the development of sexual characteristics in an organism. [1] Most organisms that create their offspring using sexual reproduction have two common sexes, males and females , and in other species, there are hermaphrodites , organisms that can function reproductively as either ...