X - Chromosome
Blaine Bettenger wrote a great article about X-chromosome inheritance. Here is the link to the article. It is worth reading. http://www.thegeneticgenealogist.com/2008/12/21/unlocking-the-genealogical-secrets-of-the-x-chromosome/
In summary, I have inherited my X-chromosomes from my Dad's mother and from my Mom's maternal line and my Mom's father's mother. The attached chart shows, in red, whom I have inherited my X-chromosomes from. Those ancestors in blue have NOT contributed to my X-chromosomes.
Source of my X-Chromosomes