Turners syndrome in females occurs due to the absence of one X-chromosome. And we know that in every woman, there is only one active X-chromosome, due to the lyonization process in which one X-chromosome is inactivated. Then why don't all women have turners syndrome, if either ways one X-chromosome does not function (is absent of inactive)?
Well, this is a very intricate question not actually well understood by medical science. Normally one of the chromosomes is expected to get deactivated while cells that have two chromosomes may function well while in others even the single chromosome may get deactivated, on the other hand all male cells with single X chromosome do not develop the condition as well and mosaics have variable degrees of involvement.
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