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.
Aug 21, 2015
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Medical researchers at Melbourne's Murdoch Children's Research Institute have made a new discovery about how a baby's sex is determined—it's not just about the X-Y chromosomes, but involves a 'regulator' that increases ...
Dec 14, 2018
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University of Minnesota Medical School and College of Biological Sciences researchers have made a key discovery showing that male sex must be maintained throughout life.
Jul 20, 2011
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A scientific analysis of more than 2,000 brain scans found evidence for highly reproducible sex differences in the volume of certain regions in the human brain. This pattern of sex-based differences in brain volume corresponds ...
Jul 20, 2020
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Klinefelter's syndrome is a genetic disorder that affects approximately one in 450 males. Each cell in the human body has 23 pairs of chromosomes. The sex chromosomes in a female are XX, and XY in men. Typically, men have ...
May 5, 2016
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It's a controversial notion, but couples undergoing fertility treatments may soon be able to select the sex of their baby—with an 80% chance of success, doctors say.
Mar 22, 2023
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Around one in 500 men could be carrying an extra X or Y chromosome—most of them unaware—putting them at increased risk of diseases such as type 2 diabetes, atherosclerosis and thrombosis, say researchers at the universities ...
Jun 10, 2022
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Most mammals, including humans, have two sex chromosomes, X and Y. One sex chromosome is usually inherited from each parent, and they pair up as either XX or XY in every cell of the body. People with XX chromosomes typically ...
Mar 21, 2022
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Mismatch between biological sex and gender identity, culminating in its severest form as gender dysphoria, has been ascribed to mental disease, family dysfunction and childhood trauma.
Jan 24, 2019
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New research presented today at the European Society for Paediatric Endocrinology meeting has found a genetic region, which may control testicle development in the foetus.
Sep 26, 2011
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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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