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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.
What this ultimately means is that, yes, there are chromosomal conditions that cause different body appearances. However, other conditions in someone who has XX or XY chromosomes, such as congenital adrenal hyperplasia, which causes a lack of the enzymes that produce the sex hormones, can also impact body appearance.
14 lut 2024 · Klinefelter Syndrome (KS): chromosomal disorder with karyotype 47, XXY, affects 1.5 per 1000 live-born males. Aetiology: extra X chromosome due to meiotic non-disjunction or mosaicism; longer CAG repeats in androgen receptor gene correlate with severity. Risk factor: advanced maternal age.
26 paź 2020 · 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). Or, some people with XX or XY chromosomes might have physical characteristics that don’t seem to align with what’s typically expected of their DNA.
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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 ...
