The Planted Tank Forum - View Single Post - The Breeding Project: Dark Rams ( Update: + New EBR/GBR Pairs)
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post #13 of (permalink) Old 10-06-2019, 09:29 PM
varanidguy
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Quote:
Originally Posted by Blue Ridge Reef View Post
That works, assuming the hets are visual dark rams. Which does happen with a few things. But if you lay this out as you drew up, the dark rams would both be bb which would only produce dark fry. I'm thinking this must be a matter of visual hets. Or something more complex entirely.

This is probably accurate -what makes it unusual is that hets aren't generally visual for the trait they are heterozygous for. I'm of the mind that these must be one of those exceptions in which the het animals are actually visual. In corn snakes, we had this with tessera, a striped corn mutation. It was at first believed to be a co-dominant gene, but after some breeding trials we realized that the Bb version of this gene looked just like the bb version. You couldn't tell them apart unless bred back to a normal. If 100% were striped, the animal was considered a "super tessera," and if 50% did, it was a regular tessera. But for love or money you couldn't distinguish the two apart. Wonder if dark rams aren't either a 2 gene combination or something a little more complex than just one recessive gene. I can't think of a scenario in which two animals showing the same recessive gene only make 25% of offspring showing it.
I had this thought as well, that dark rams could be a codominant color mutation, and getting jet blacks could be their "super" variant. However, if that were the case, one should be able to breed a black ram to a normal ram and still get dark offspring. If that's not the case, then the signs point to it being a recessive trait with the heterozygous animals carrying a visual marker, like you're saying. It's very interesting.


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