That information would be great to know.

Chromosomes contain all the genes that make up an animal. Each trait has either become natural through evolution for that trait or it is an oddity, a mutation in the genes or caused by environmental factors.
If Hypomelanism is caused by a mutant gene, or interpretation of that gene it can be passed on. Since animals recieve one set of chromosomes from each parent to combine into pairs, the Salmon trait is most likely a product of this.

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