Turner Syndrome and X chromosomes

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Turner Syndrome and X chromosomes

Post by ofekistit » Sun Nov 17, 2013 3:33 pm

Hi, I have a question.

My university biology professor told us that one X chromosome in women is always bundled up, and we have some cells with the maternal x chromosome bunched up, and the others have the paternal x chromosome bunched up.

Essentially, only one is in use at any given time, right?

I asked how this affects females with Turner Syndrome and was told there is no such thing. :evil: :shock: :( (yes this is a professor in a university)
So why do females with Turner syndrome have such defects? They also have only one X chromosome active, no?

What causes this?

Thanks so much in advance!

Confused Student

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Location: New York, USA

Post by Darby » Mon Nov 18, 2013 2:01 pm

The inactivation isn't happening at the very beginning of embryological development.

http://web.udl.es/usuaris/e4650869/doce ... moInac.pdf

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