Most Indo - European languages are grammatically gendered, sometimes
all nouns, sometimes only personal pronouns (le, la, sie, er).
However, Ural-Altaic languages (Hungarian , Finn, Estonian) are devoid
of gender signals.  They are different language systems.
But what can be the sources of these diffeences in gendering?  Thanks.

carmi604,

This is an interesting question, and almost certainly one I would
tackle myself, if not for a bit of a price discrepancy.  I would
suggest you consult http://answers.google.com/answers/pricing.html for
an in-depth analysis of how to price questions.  The $3.00 you have
offered would probably suffice for a quick listing of gendered
languages, but the amount of work involved with tracking down sources
and composing a response to a question this detailed is probably on
the order of an hour or two, in which case a more appropriate fee
might be $20 or more.  If you re-price your response, I'd be willing
to bet you would get a very prompt response :-)

--bananarchy-ga