REFLECTIONS.....around the notion of 'spalding'!

[Dany12]

AA BB CC DD EE FF GG


AA BB CC DD EE FF GG

Your starting hypothesis is a 'we say' ... a sound that runs ... spaldings do not reproduce pure.
Has this already been scientifically proven?
There are examples in other species?
The two genomes here are genomes that have undergone cosmic bombardment?

 

[Rosa moschata]

Thank you for your intervention!


It's very very rare ... no ?
" the hybrid offspring will pass on newly-recombined chromosomes made from pieces of both"
Specific for hybrids?
The father bring 1/2 of the genome of the offspring the other half is brought by the mother.Why would there be permanent partial recombination? accidents are rare ... this is not the rule!
In a cross IB X IB that happens too?
How to produce a high percentage spalding with blue-scaled feathers in the neck?
The green color crushes the blue color!
View attachment 1280553

You are incorrect -- crossover is not rare. In fact, virtually every egg or sperm produced will show evidence of crossover, somewhere. The "rare" part is the odds of it happening at a specific point. It's a bit like the lottery -- that someone will win is very likely, but the odds that one specific person will win are very low.

Crossover occurs during gamete production, not within the body cells. Recombined chromosomes would be found within the sperm or eggs produced.

 

[Rosa moschata]

Your starting hypothesis is a 'we say' ... a sound that runs ... spaldings do not reproduce pure.
Has this already been scientifically proven?
There are examples in other species?
The two genomes here are genomes that have undergone cosmic bombardment?

I'm getting confused by your use of terms -- perhaps it's a language barrier.

We don't need to prove "scientifically" that Spaldings don't breed true because the effect has been documented in many other crosses between hybrids. When a phenotype is the result of being heterozygous for particular traits that are co-dominant, maintaining that phenotype requires that heterozygosity is maintained. As with the "pied" phenotype, which results from having one copy of White and one copy of Pied, breeding two together results in the independent assortment of the Pied and White mutations -- some have one of each, others have two of one and none of the other. Now this is just one trait -- imagine all the traits of Blue and Green peafowl that need to be both expressed to result in the equal blend seen in first-generation Spaldings. Think of the teal-colored neck feathers, for example. In a far simpler way of explaining it, you need equal parts blue and green to make that teal color. If the ratios shift, the color will lean more to blue or green.

It might be possible, after many generations of selective breeding, to achieve a relatively pure-breeding strain of Spaldings. But these birds would have to be homozygous for some "Blue" versions of genes, and also homozygous for other "Green" versions of genes. Remember my example with the colored letters -- that would mean that every letter was had in a matched pair, but the pairs could be different colors. So something like all As, Cs, Ds, and Gs are red, while all Bs, Es, and Fs are blue. The result would not look like a first-generation Spalding, but some other amalgamation of Blue and Green traits put together.

 

[Dany12]

Overall when we look at the results obtained in the creation of spalding in various colors we have results 'expected' ... nothing really different ... it doesn't go in all directions! It is much more stable than we think so!

 

[Rosa moschata]

That's because the trend in breeding Spaldings is the ever-increasing amount of Green blood, with the goal of producing birds that look as Green as possible, but with mutations derived from the Blue species. As far as I've seen, breeders aren't aiming for the look of first-generation Spaldings as their goal.