Downunder ~ Genotype: 
- DU/du
Downunder is a dominant marking gene that adds color to the belly that may extend from the chin to the area between the hind legs. Downunder is thought to be a lethal homozygous gene, meaning an animal that inherits two copies of downunder gene (DU/DU) is never born, but is rather, resorbed in utero. Downunder, when combined with roan and the dominant white spotting gene, has shown to produce megacolon. Megacolon (MC) is a condition where the nerves that control intestinal function, do not fully form. This causes an inability to pass feces. They become bloated and malnourished. This is an incurable condition, and so it is in the rat's best interest to avoid these combinations.

Description: Downunder being a marking gene that adds color to the belly, is ideally combined with markings that would otherwise have a clean white belly. Downunder does not display visibly with Irish, english Irish, or Essex. Ideally colors would be darker as this showcases the markings more clearly. Agouti based varieties do not show the belly stripe well, due to the lighter underside.

The downunder rat will have standard markings on the topside, with a corresponding belly stripe or spots. A "mirror image." A belly stripe should to be as solid as possible. If the corresponding markings are spots, the goal should be numerous and evenly spread spots on the underside.

Vari-capped is a variety described by the AFRMA. This is a capped rat with spots running down the spine and sides like a variegated. And spotting present on the belly.

General Faults
* Incomplete hood or belly stripe.
* White spots on the belly stripe.
* Uneven belly marking.
* Inadequate spotting ​

History:
 History: Downunder originated at Rodent Ranch Stud (Owned by club president Cindy Sautchuck) in New South Wales, Australia. The first Downunder produced, was hairless, however he died at 16 weeks due to complications with the hairless gene. A subsequent breeding of the same pair produced the first furred Downunder rat, and he was called Enigma.
The reasoning for the name "Downunder," was twofold. The name corresponds to the nature of the marking, as well as Australia being synonymous with the term Down Under.

Downunder rats were first imported to the United States by Connie Perez Of Rat Genesis, in December 2002.

President's Notes:
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COLOR 
Agouti  
American blue agouti
Beige 
Black 
Blue
Buff 
Cinnamon
Champagne
Chocolate 
Chocolate agouti
Chocolate dove
Cocoa 
Coffee
Fawn
Mink
Pearl  
Platinum
Platinum agouti
Russian blue 
Russian blue agouti 
Russian cinnamon
Russian dove
Russian silver 
Russian silver agouti 
Silver Fawn  
UK Mink 
UK Lilac
Umber (Aussie Mink/brown) 

COLOR - C LOCUS 
Albino/Ivory 
Burmese 
Golden/Cream
Himalayan
Marten /Agouti Marten
Siamese Sable
Siamese

COLOR - MODIFIERS 
Marble 
Merle

FADING GENES 
Chinchilla 
Essex 
Frost 
Roan 
Variety-Breed Colors

COAT 
Bristle 
Hairless 
Harley 
Rex
Satin 
Silvermane
Standard
Velveteen 

MARKINGS
Bareback  
Berkshire
BEW (Black Eyed White)   
Blazed 
Capped
Dalmatian 
Dominant white spotting 
Downunder 
English Irish  
Irish 
Hooded
Masked 
Variegated
Odd-Eye 

BODY
Dwarf    
Dumbo 
Standard Ear
Manx