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Posted by patricia sherman on August 10, 2002 at 15:43:35:
In Reply to: a few more notes... posted by Dwight Good on August 10, 2002 at 10:04:02:
:Tricia,
:I believe that eye problems are strictly associated with the leucistic mutation, as chrish suggested. It doesn't affect normal colored individuals, I think Dr. Bechtel did work on this in the early/mid 80's.
That is interesting.
:But do you think it is possible for a linked gene to be inherited as a simple recessive among individuals (as in my breeding examples?)
Yes, I believe that would be possible in this case. It certainly would explain what you're seeing and describing to me. In cats, we see that blue-eyed whites are almost invariably stone deaf. This is a clear example of two simple recessive genetic factors being clearly linked. In the breeding of merle-coloured dogs, the merle gene is also inherited as a simple recessive, and is proven to be linked to a lethal factor. One cannot breed two merles together. In order to produce merle progeny, one must mate either two heterozygous individuals, or a merle and a heterozygous normal.
:Or do you think it could have just been 'dumb' luck that I don't get bugeyed animals from certain females??
No. I don't think "luck" has anything to do with it. With the number of animals that you've bred, it is a statistical certainty that if those females possessed the gene, there'd have been some defective progeny produced by them.
:Also for what its worth, all the bug eyed specimens I have seen were males. Could it also be a sex linked trait???
What an intriguing tidbit of information. The numbers of individuals (three) to which you apply this observation are too few to determine whether or not it is linked. If so, then one could almost be sure that the bug-eyed gene lies on the "Y" chromosome (unless reptiles are like birds, oddly in which "YY" is the female, and "XX" is the male).
Tricia
