Re: 'Albino' Leo?

Posted by Chris Newsom on October 30, 2001 at 16:40:10:

In Reply to: 'Albino' Leo? posted by Tom on October 30, 2001 at 15:44:45:

The way I see it is this. Tremper X Rainwater = normals, that's a given. Those normals are double heterozygous for Tremper and Rainwater albino. When these double hets are bred to each other, in theory you should get a ratio of 9:3:3:1 or, 9 normals: 3 Tremper albino: 3 Rainwater albino: 1 animal expressing both albino traits.
However, I don't think you'll ever get that animal expressing both albino traits. Why? Tremper line has been proven to be what's called a tyrosine positive (T+) albino. Tyrosine is the amino acid responsible for melanin production. Since the Tremper line is positive for this, that means step in melanin production isn't fully defective resulting in an albino still, but one that produces subtle to strong amounts of melanin. Thus why you have VERY light brown Tremper albinos and VERY dark brown Tremper albinos. Now the Rainwater test results for tyrosine haven't been noted yet. I believe the person responsible for proving the Tremper line T+ hasn't been able to get a good sample for the Rainwater test. But if it does test to be tyrosine negative (T-), which is visually appears to be, then the following would probably result from the double het cross.

You would get normals and both Tremper and Rainwater albinos, but that 6.25% that would be an expression of both albinos would probably result in Tremper line. You're probably scrtaching your head at this statement, but here's the reason why. Albinism is a recessive trait, meaning that melanin production is dominant. Since Tremper line is T+, producing slight amounts of melanin, it would, theoretically, be dominant over the Rainwater albino.

only time will tell though. I believe Golden Gecko is one of a few breeders with the double hets. Maybe they'll be so kind to replying to this post and tell us what their outcome has been, pending they crossed the double hets back to each other.

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: The way I see it is this. Tremper X Rainwater = normals, that's a given. Those normals are double heterozygous for Tremper and Rainwater albino. When these double hets are bred to each other, in theory you should get a ratio of 9:3:3:1 or, 9 normals: 3 Tremper albino: 3 Rainwater albino: 1 animal expressing both albino traits. : However, I don't think you'll ever get that animal expressing both albino traits. Why? Tremper line has been proven to be what's called a tyrosine positive (T+) albino. Tyrosine is the amino acid responsible for melanin production. Since the Tremper line is positive for this, that means step in melanin production isn't fully defective resulting in an albino still, but one that produces subtle to strong amounts of melanin. Thus why you have VERY light brown Tremper albinos and VERY dark brown Tremper albinos. Now the Rainwater test results for tyrosine haven't been noted yet. I believe the person responsible for proving the Tremper line T+ hasn't been able to get a good sample for the Rainwater test. But if it does test to be tyrosine negative (T-), which is visually appears to be, then the following would probably result from the double het cross. : You would get normals and both Tremper and Rainwater albinos, but that 6.25% that would be an expression of both albinos would probably result in Tremper line. You're probably scrtaching your head at this statement, but here's the reason why. Albinism is a recessive trait, meaning that melanin production is dominant. Since Tremper line is T+, producing slight amounts of melanin, it would, theoretically, be dominant over the Rainwater albino. : only time will tell though. I believe Golden Gecko is one of a few breeders with the double hets. Maybe they'll be so kind to replying to this post and tell us what their outcome has been, pending they crossed the double hets back to each other.

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