Mary Lyon effect

A Dictionary of Zoology | 1999 | 471 words | Copyright

Mary Lyon effect The inactivation of one of the X-chromosomes in female mammals; its discovery was predicted by the geneticist Mary Lyon, who observed that otherwise females would have considerably more genetic material than males, since in mammals the Y-chromosome is tiny whereas the X-chromosome is very large. In marsupials it is the paternally derived X that is inactivated, but in placentals paternal or maternal are inactivated at random in different cell lines.

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MICHAEL ALLABY. "Mary Lyon effect." A Dictionary of Zoology. 1999. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "Mary Lyon effect." A Dictionary of Zoology. 1999. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O8-MaryLyoneffect.html

MICHAEL ALLABY. "Mary Lyon effect." A Dictionary of Zoology. 1999. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-MaryLyoneffect.html

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