Thread: The X chromosome you inherit from your mother, is it either of her two X chromosomes?

  1. #1
    Registered User
    Join Date
    Dec 2001

    The X chromosome you inherit from your mother, is it either of her two X chromosomes?

    As you probably know, a man inheritated an X chromosome from his mother, while he inheritated a Y chromosome from his father, and a woman inheritated one X chromosome from her mother, and another one from her father.

    Now, I am wondering about this, the X chromosome that either sex inheritated from his/her mother, could that be either of her X chromosomes, or is it perhaps a combination of the two?


         XX    XY                                     XX    XY
        |      |                                      |        |
         \    /                                        \      /
          X Y - offspring, man | OR |        X Y - offspring, man
    Is it like the above example, where it would be a 50% chance of inheritating either of the mother's chromosomes.

    other example:

        |XX|  XY
        -----    |
        |     |
         \   /
           X Y
    Or is it like the other example, where the mother's X chromosome is a combination of her two X chromosomes.

    Hope you can answer my question.

    EDIT: never mind about the examples, I think you can understand my question in pure theory anyway
    Last edited by Zewu; 06-28-2003 at 08:27 AM.

  2. #2
    Join Date
    Nov 2002
    When a female produces eggs, each one of them has one X chromosone. Every single one of them. When a male produces sperm, each one has either an X or a Y. If a sperm with an X fertilizes the egg you get a girl. When a sperm with a Y chromosone fertilizes the egg you get a guy. So no it does not matter which X, because every X in the female is in a different egg. The whole XX and XY thing is used to figure out the chance of how many will be girls/boys and how many will have sex linked diseases like being color blind etc. I think you were trying to make it more complicated than it really is

  3. #3
    Wannabe Coding God
    Join Date
    Mar 2003
    actouly the gender is not determined by the X & Y cromosons. It's determend by a protoin witch they make,sometimes they make the wrong protoin so it is posible for a female to be XY and a male to be XX. But it is very unusal.
    They say that if you play a Windows Install CD backwords, you hear satanic messages. That's nothing; play it forward and it installs Windows.

  4. #4
    Toaster Zach L.'s Avatar
    Join Date
    Aug 2001
    Then there are bizarre conditions like XXX, XXY, and XYY.

    Oh no... biology is coming back to me.
    The word rap as it applies to music is the result of a peculiar phonological rule which has stripped the word of its initial voiceless velar stop.

  5. #5
    Registered User DDPhoenix's Avatar
    Join Date
    Jun 2003
    I think both Shogun and SourceCode are right on this one: there's a protein called the "Testis-Determining Factor" made by a gene on the Y-chromosome that starts a whole sequence of events that lead to the development of a male fetus (activates and deactivates other genes/proteins). Without this gene and protein, the fetus will become female by default.

    Out of curiosity, why do you ask?

Popular pages Recent additions subscribe to a feed

Similar Threads

  1. to inherit or not to inherit ...
    By Greenhorn__ in forum C++ Programming
    Replies: 16
    Last Post: 09-01-2008, 11:37 AM
  2. Friend cannot inherit from private subclass
    By MWAAAHAAA in forum C++ Programming
    Replies: 4
    Last Post: 11-19-2006, 04:44 PM
  3. Half Humanoid, half Chimpanzoid
    By Zewu in forum A Brief History of
    Replies: 8
    Last Post: 06-19-2004, 04:23 PM
  4. Two questions about genetics
    By Zewu in forum A Brief History of
    Replies: 1
    Last Post: 11-16-2002, 10:43 PM