I have a rather in depth genetic article I review periodically because each time I go back I understand a bit more as I am constantly learning from other sources where possible and then I go back to the more complicated stuff to see if it's less gobblety-gook.

 

At any rate, I was reading about intragenic crossover and found that mathematically/genetically it is possible to produce a green budgie from two blue budgies.

 

Basically it would go something like this - instead of having a b1 b2 (yellowface type 1 with two recessive blue genes 'b1' and 'b2') bird, the genes cross over (rare occurance) during replication in such a way that you get one gene that is b1 b2 (both flawed sections cross over onto the same allele) and a second gene that is now completely functional (ie dominant green gene).

 

However, this could only occur in a pair with at least one yellowface/goldenface bird and one normal blue bird given the need for the flaw to be on differing locations on the same allele.

 

Bizarre! I never would have guessed you could get a green bird from two blues!

That is very interesting and unusual. Thank you for this insight.

okay, I think I can understand how this would occur. This is the ultimate in mutation I suppose. I wonder could it produce green offspring? What are the chances of this happening? 1 in a million?

By rights the green gene should be absolutely functional in every normal sense of the word and it would produce normal greens if that gene was passed on. What is interesting to me is the 'new' hybrid b1b2 gene. Does that mean the hybrid gene alone can produce yellow? A true dominant yellowface type 1? Or does it mean that the gene is double flawed and will never produce yellow?

By rights the green gene should be absolutely functional in every normal sense of the word and it would produce normal greens if that gene was passed on. What is interesting to me is the 'new' hybrid b1b2 gene. Does that mean the hybrid gene alone can produce yellow? A true dominant yellowface type 1? Or does it mean that the gene is double flawed and will never produce yellow?

 

The Yellow Face gene is beyond me still at this stage ....