Posted by Mengistu on Saturday, February 2, 2013 at 3:32am.
There are several recessive disorders carried on the X chromosome (X-linked genes). Women may have a dominant normal gene on the other X chromosome to prevent the disorder from showing up in the phenotype. There would be no such dominant gene for males.
Although more males are born, partially because of these genetic disorders, women live longer.
http://en.wikipedia.org/wiki/Category:X-linked_recessive_disorders
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