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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...
8 sie 2023 · Cytogenetic testing is the examination of chromosomes to determine chromosome abnormalities such as aneuploidy and structural abnormalities. A normal human cell contains 23 pairs of chromosomes, including 22 pairs of autosomes and a pair of sex chromosomes (XX or XY).
14 gru 2023 · Most of us were raised with the idea that there are two sexes: male and female. We’re usually told that people with XY chromosomes are male and people with XX chromosomes are female.
