Hairless rats?

[littleindiangirl]

Yup, rex is a dominant gene. One rex gene causes crimpy or curly fur, two genes causes hair loss. Some stay totally hairless, others have furry legs and faces, others morph and change their look on a regular basis. True hairless is a recessive gene. One gene creates a normal looking rat, two creates a totally hairless rat (though occasionally some will keep little socks or furry faces).

LOL, yea I know rat genetics pretty well, did you mean to quote me? Anywho, there are a few different genes that cause rexing/curling. Not just one. And I am sure there are more than 2 hairless genes to differing degrees of hairlessness.