Dictionary of Human Evolution and Biology

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Random-X Inactivation

Kind of X inactivation seen in Eutheria, but not marsupials. In the Eutheria (including humans), the process of inactivation is random in the cells of a female fetus; however, all of her extraembryonic membranes (the amnion, placenta, and umbilical cord) have the father’s X chromosome nonrandomly inactivated.

See paternal-X inactivation.

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