U.S Supreme Court Justice Ketanji Brown Jackson in her Senate confirmation hearing had difficulty defining “woman.” IIRC, she she couldn’t do it, saying “I’m not a biologist.” Well, I’m not either. But I do have a BS degree in Zoology from way back in 1977.
Without putting much thought into it, here’s my proposed definition of an adult male or female:
If you’re 18 or older (“adulthood” in the U.S.) and a majority of your body’s cells have XY chromosomes, you’re a man. If not, you’re a woman.
Check out this .gov website for alleged facts on sex chromosomes (X and Y). A snippet:
Variation in the number of sex chromosomes in a cell is quite common. Some men have more than two sex chromosomes in all of their cells (the XXY variation is called the Klinefelter syndrome), and many men lose the Y chromosome from their cells as they age.
“Variation in the number of sex chromosomes in a cell is quite common.” Quite common? Klinefelter syndrome occurs in 1 to 2.5 per 1000 boys and men (0.1 to 0.25 percent). It’s news to me that “many men lose the Y chromosome from their cells as they age.”
If a “man” wants to compete as a “woman” in women’s sports, he/she should have a majority of cells with XX chromosomes. Not all cells, but at least 50.001%
Steve Parker, M.D.
Advanced Mediterranean Diet 