The genetics of different color morphs in sand boas and the Rosy Boa have been discussed on this forum now and then. If I were to post the results of my crosses between the two size morphs of the Rubber Boa, would anyone be interested in trying to determine the mode of inheritance that is involved?



I'm sure we could try and put together the pedigree and take a shot at it, but there are two concerns I would have. First, length data are generally not qualitative enough because of the overlap in the size classes. For example, are males of the large morph smaller that females of the small morph? Is there a size threshold that separates females of one group from the other?

Secondly, are the crosses between the two size classes intermediate in size? If so, it points to a type of inheritance that won't be easily identified by a simple pedigree. Human size is polygenic and I suspect snake size is as well.
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Chris Harrison

San Antonio, Texas

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