Sugar is a dominant gene without a super. It is considered to be the same gene as Calico. Sugar has white sides, a black back and orange lining. Sugar can be high white, medium white or low white, similar to Piebald. High white Sugars have a higher chance to produce high white offspring but can also produce low white offspring. Sugar combines very well with highlighter genes and pastel, but tends to wash away color once you go to triple or more combo's. It is sometimes hard to identify Sugar in spider (combo's) as a baby, especially in low white examples. 
We only have one sugar female. 
The typical white scales of sugar remain into adulthood but the bright orange fades away.