The thing to watch for is combos that are taking too long to make and you don't hear of any of the homozygous decedents for one of the morphs turning up to even be het for the other. Unfortunately it will take a long time to get enough public info to come close to proving two mutations are on the same chromosome. It's much easier to prove the other way like the quick killer bee indicating spider and pastel probably aren't on the same chromosome or the same for the cinnamon and pastel combos last summer. It would actually be interesting if you could pick up on a combo project appearing to involve two mutations on the same chromosome early as without a crossover all the normal looking babies would be double hets rather than the expected possible double hets.

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