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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.
XX and XY chromosomes are not what determines a person's sex - as others have explained, there are many exceptions to that generalisation ... a person's biological sex is determined by the gonads which are present at birth.
14 gru 2023 · Sex chromosomes are chromosomes that affect your sexual anatomy and reproductive development. Most of us were raised with the idea that there are two sexes: male and female.
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 ...
28 maj 2024 · One half of each pair of chromosomes comes from one parent, while the other half comes from the other parent. The 23rd pair are the X and Y chromosomes, often called the sex chromosomes. The other 22 pairs are called autosomes.
2 lut 2016 · The effects of X chromosome number are likely the result of inherent differences in expression of X genes that escape inactivation, and are therefore expressed from both X chromosomes in XX mice, resulting in a higher level of expression when two X chromosomes are present.
