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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.
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.
It’s also possible to have four X chromosomes—it’s called Tetrasomy X. It’s also possible to have Pentasomy X. I’m not sure if having more than 5 X chromosomes is possible, though.
The 23rd pair of chromosomes is either a pair of; (a) XX (female) or (b) XY (male) chromosomes. So, females have two copies of the X chromosome, and males have one X and one Y chromosome; all the cells in the female contain only X chromosomes, while the male has both X and Y chromosomes.
29 sie 2022 · It’s incorrect that, “according to science”, people exist only in the two distinct chromosomal flavours of XX and XY. More than this, not all people with XY chromosomes have a typically male anatomy, and not all people with XX chromosomes have a typically female anatomy.
26 paź 2020 · XX and XY with the aforementioned expressions are the most common sex chromosomes and corresponding organs, but they’re not the only ones. Some people have differing sex chromosomes, such as those who are born with an extra X chromosome (XXY) or who are missing an X chromosome (XO).
1 wrz 2017 · 1 min read. 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. Pitch...
