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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.
In simple terms, the human body is designed to work off of one X chromosome. This makes sense, because males are XY, while females are XX. So in females, one X chromosome in each cell is "turned off". Therefore, if you're XXY, things mostly work as intended, so you might not know this affects you.
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]
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.
In the XY sex-determination system, the female-provided ovum contributes an X chromosome and the male-provided sperm contributes either an X chromosome or a Y chromosome, resulting in female (XX) or male (XY) offspring, respectively.
5 gru 2017 · Some chromosomes are called sex chromosomes which help to determine whether someone has the reproductive body parts of a boy or a girl. Usually, someone who has female body parts has two X chromosomes, and someone who has male body parts has an X and a Y chromosome. Sometimes, this is not the case.
