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[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". "Sex assignment" did not occur in writing prior to the 1960's. It is used ~100 times less frequently than "determination ...
Phenotypic sex refers to the structures of the external and internal genitalia. [6] Six weeks elapse after fertilization before the first signs of sex differentiation can be observed in human embryos. [5] The embryo and subsequent early fetus appear to be sexually indifferent, looking neither like a male or a female.
[1]: 24 [4] Sex differences in the brain have been found in many structures, most notably the hypothalamus and the amygdala. [2] However, few of these have been related to behavioral sex differences, and scientists are still working to establish firm links between early hormones, brain development and behavior. [2]
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.
Late-onset gender dysphoria does not include visible signs in early childhood, but some report having had wishes to be the opposite sex in childhood that they did not report to others. Trans women who experience late-onset gender dysphoria are more likely be attracted to women and may identify as lesbians or bisexual.
Sex determination systems may have evolved from mating type, which is a feature of microorganisms. Chromosomal sex determination may have evolved early in the history of eukaryotes. [82] But in plants it has been suggested to have evolved recently. [83]
Generally, gender approaches to climate change address gender-differentiated consequences of climate change, as well as unequal adaptation capacities and gendered contribution to climate change. Furthermore, the intersection of climate change and gender raises questions regarding the complex and intersecting power relations arising from it ...
Sexual selection is a biological way one sex chooses a mate for the best reproductive success. Most compete with others of the same sex for the best mate to contribute their genome for future generations. This has shaped human evolution for many years, but reasons why humans choose their mates are not fully understood.