Ears :  Standard Ears: (Du/Du or Du/du) Tulip shaped and held erect over the head         Dumbo Ears: (du/du) Saucer shaped held low on the sides of the head  * Dumbo ears are a simple recessive gene.    Eyes :  Dominant Black Eyes: Be/be or Be/Be *Be/ Shows on Siamese [ch/ch], Himalayan [c/ch] and Albino [c/c] rats. *Be/Be will result in all Black eyed (Be/be) offspring when bred to a non Black eyed rat.    Red/Ruby: Red eye Dilute/R.E.D [r/r] *[R/r] = Black eyes carrying RED *[R/R] = Homozygous Black eyes. Will not produce RED offspring.    Pink: Pink Eye Dilute/PED (pp) *[P/p] = Black eyes carrying PED *[P/P] = Homozygous Black eyes. Will not produce PED offspring    Odd Eyes: Caused by white spotting such as H(e)   Tail :  Standard:    Tailless/Manx: ("Fist" is not a good example of a tailless. There should be no tail nub. Tailless/Manx is still an undetermined gene(s) There appear to be both dominant and recessive forms that work in combination with other undetermined genes .   Body :  Standard    Dwarf: [dw/dw] Pictured here is a one year old dwarf male next to an 8 mth old standard sized male. *Dwarfism is a simple recessive gene. *[Dw/dw] = Standard size carrying the dwarf gene *[Dw/Dw] = Homozygous