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Posted by chris_harper2 on March 19, 2003 at 08:58:48:
In Reply to: T+ and T- Black Rats, Homozygous for Both? posted by RobG on March 19, 2003 at 02:34:50:
::My thinking is that since the metabolic pathways that are affected are different they can be homozyougs for both traits,
I think you are correct regarding black ratsnakes, but just because the pathways are different does not mean that the T+ and T- traits are controlled by two different gene loci. It could be that these traits are controlled by different alleles of the same gene loci.
There is an example of this in herpetoculture but I cannot think what it is at the moment (still waking up today). It might be the melanistic form and amelanistic form of Thamnophis s. sirtalis but I'm not sure.
So with this example an individual could be heterozygous for both recessive alleles but could not be homozygous for both.
Regardless, I still think the T+ and T- traits are controlled by two different gene loci in Pantherophis obsoleta.