Ultramel is actually the combination of 2 genes, ultra and amel, that are located at the same locus so will work together when present. Breed a homozygous ultra (one of the hypo genes) to a homozygous amel and all the babies will be ultramel, which generally looks halfway between the 2 parent phenotypes (basically a lightish hypo). Breed those ultramel offspring together and you will get 1/4 homozygous ultra, 1/2 ultramel, and 1/4 amel.
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