Color help?

[Kim Molsberry]

Hello,
 I have a male gerbils that is about 10 weeks old. I thought he was a
Silver Nutmeg but he never got the ticking his brother got that WAS a
silver nutmeg. At the moment he has a ticking line on his head and his
body is off white on the sides and a cream/yellow on his back. Could he
be a Polar Fox?
Please Help!
Kim and Gerbils
http://www.angelfire.com/or2/gerbilsRus/index.html