Psychology & Psychiatry

The biological origins of sexual orientation and gender identity

Male? Female? The distinction is not always clear. Exploring the scientific evidence for the biological origins of sexual orientation and gender identity must continue to both enhance patient care and fight discrimination.

Other

When someone is raised female and the genes say XY

(AP) -- It's the birth defect people don't talk about. A baby is born not completely male or female. The old term was hermaphrodite, then intersex. Now it's called "disorders of sexual development." Sometimes the person ...

Medical research

'Achilles' heel' in Y chromosome linked to sex disorders

The unique mechanism behind the evolutionary survival of the human Y chromosome may also be responsible for a range of sex disorders, from failed sperm production to sex reversal to Turner Syndrome.

Genetics

Testosterone concentrations in men affected by genetic makeup

Genetics play an important role in the variation in, and risk of, low testosterone concentrations in men. A study by the CHARGE Sex Hormone Consortium, published in the open-access journal PLoS Genetics on Thursday, 6th October, ...

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Sex-determination system

A sex-determination system is a biological system that determines the development of sexual characteristics in an organism. Most sexual organisms have two sexes. In many cases, sex determination is genetic: males and females have different alleles or even different genes that specify their sexual morphology. In animals, this is often accompanied by chromosomal differences. In other cases, sex is determined by environmental variables (such as temperature) or social variables (the size of an organism relative to other members of its population). The details of some sex-determination systems are not yet fully understood.

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