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The gene for 5-alpha reductase (the male pattern baldness gene) has been mapped to chromosome 5, not the Y chromosome. That means you can get it from any of your ancestors, it just won't show up in the women.
Some women have three, four, or even five X chromosomes per cell. Some women have only one. Some men can also have two or more X chromosomes, in addition to their Y. It's even possible to be biologically female and have the karyotype XY, or be biologically male with an XX karyotype.
In simple terms, the human body is designed to work off of one X chromosome. This makes sense, because males are XY, while females are XX. So in females, one X chromosome in each cell is "turned off". Therefore, if you're XXY, things mostly work as intended, so you might not know this affects you.
30 maj 2007 · We've identified new molecular mechanisms of sex determination. In particular we've discovered genes, such as WNT4, that's female-specific and not present in males, and that's sort of shifted the...
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.
1 wrz 2017 · Intersex individuals—those for whom sexual development follows an atypical trajectory—are characterized by a diverse range of conditions, such as 5-alpha reductase deficiency (highlighted in...
In humans and many other animal species, sex is determined by specific chromosomes. How did researchers discover these so-called sex chromosomes? The path from the initial discovery of sex ...
