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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.
So, if there's a translocation of the SRY gene from a Y to an X chromosome, then you can end up with an XX male (SRY+). Further, a Y chromosome that has lost the SRY gene or doesn't have a functional version of it results in an XY female (SRY-).
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.
XX males that are SRY-positive have two X chromosomes, with one of them containing genetic material (the SRY gene) from the Y chromosome; this gene causes them to develop a male phenotype despite having chromosomes more typical of females. [2]
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...
23 mar 2024 · On average, most people assigned male at birth have XY chromosomes, while most people assigned female at birth have XX chromosomes. However, other sex chromosomal variations frequently exist as a result of the loss, damage, or addition of one or both of the sex chromosomes.
1 wrz 2017 · Beyond XX and XY: The Extraordinary Complexity of Sex Determination. A host of factors figure into whether someone is female, male or somewhere in between. By Amanda Montañez.
