Wednesday, March 4, 2009

How does a person inherit this genetic disorder?


Fragile X is a single gene disorder carried by either a mother or a father. It is transmitted from parent to child through the genetic information (DNA) that is in the sperm and eggs.


Is it dominant or recessive?


The inheritance is different from common dominant or recessive inheritance patterns. A fragile area on the X chromosome (FMR1) has repeats in the genetic code. The more repeats, the more likely there is to be a problem. Boys and girls can both be affected, but because boys have only one X chromosome, a single fragile X is likely to affect them more severely.


Is is genetic or chromosomal?


It is transmitted from parent to child through the genetic information in the sperm and eggs.


Sources:

How is Fraglie X Syndrome Inherited?. 30 Sep. 2008. The National Fragile X Foundation. 4 Mar. 2009 <http://www.fragilex.org/html/inheritance.htm>.


"Fragile X Syndrome." Fragile X Syndrome. 1 The Health Central Network Inc.. 4 Mar. 2009 http://www.healthscout.com/ency/1/001668.html.


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