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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.
Sex is assigned as either male or female, leading to specific terms: [12] [2] [20] Assigned male at birth A person of any age and irrespective of current gender whose sex was assigned as male at birth. Often shortened to AMAB. Synonyms include male assigned at birth (MAAB) and designated male at birth (DMAB). [21] [22] Assigned female at birth
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.
When determining the sex of the baby, ultrasound technicians look for sex organs: either the presence of a penis for a boy or labia for a girl. "Penises are pretty obvious," says Larkin. "But ...
The pelvis is, in general, different between the human female and male skeleton. [12] [13] Although variations exist and there may be a degree of overlap between typically male or female traits, [12] [13] the pelvis is the most dimorphic bone of the human skeleton and is therefore likely to be accurate when using it to ascertain a person's sex ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 9 December 2024. Atypical congenital variations of sex characteristics This article is about intersex in humans. For intersex in other animals, see Intersex (biology). Not to be confused with Hermaphrodite. Intersex topics Human rights and legal issues Compulsory sterilization Discrimination Human rights ...
A 2005 study on the gender identity outcomes of female-raised 46,XY persons with penile agenesis, cloacal exstrophy of the bladder, or penile ablation, found that 78% of the study subjects were living as female, as opposed to 22% who decided to initiate a sex change to male in line with their genetic sex. [71]
In the XY sex-determination system, the female-provided ovum contributes an X chromosome and the male-provided sperm contributes either an X chromosome or a Y chromosome, resulting in female (XX) or male (XY) offspring, respectively. Hormone levels in the male parent affect the sex ratio of sperm in humans. [25]
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