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If Pearl grey is dominate-- a pearl flock should only produce pearl grey offspring- giving they are pure pearled grey. if you have only one non-pure pearled grey-- you should never get anything else either-- unless you keep an offspring from it, and breed back to the parent.- then you may get something else (whatever was hidden in the wood pile.)
As I stated before, I have have first hand experience that Guineas displaying dominant color and pearling genes can and do produce recessive gened keets. It may go against everything you know about dominant and recessive genes, but it's normal for hidden recessive to show up in hatches from dominant gened parents. If it wasn't possible, then how else would your Slate Hen have hatched out of fully-pearled parents?
We'll use my slate female.. If fully pearled is dominate over partially pearled, and non-pearled is recessive under partially pearled-- using logic-- that hen is as recessive as she can get-- meaning that if mated back to another slate-- both parent's should be non-pearled-- meaning only non-pearled offspring should be born.
Yes, her non-pearling gene is recessive. But since she came from a Pearl Grey X Buff Dundotte breeding (I think that's what you said, way back?) she actually carries 2 copies of the fully-pearled gene in her background. Don't mean to sound like a broken record, but since she is carrying the fully pearled gene, she will produce some keets (possibly a lot) that are fully pearled, and pass those fully-pearled genes to all of her offspring (along with all the other genes she is carrying). Genes are carried in each bird, either hidden or displayed/expressed and passed down to every one of their offspring, but that doesn't mean they will always get used/show up in every hatch.
Now, colors obviously are more confusing- as you have base colors of grey(pearl, violet, royal purple), brown (choc, buff, etc), lavender (??? whatever slate, lavender are???), and white. Does white work as a mask (dom), or a hidden (rec). Using chicken talk- Cornish white is recessive, but the white in White Laced Red Cornish-- is dominate. Cornish can carry both types in the same bird...
There aren't dominant or recessive versions of White for Guineas, and White is not an actual base color in Guineas, it does cover up the base color tho. Pure White Guineas come from breeding 2 Pied birds, but only 25% of the keets turn out to be pure White. Pied/White doesn't dilute the colors, it only masks color and pearling. Pure White keets usually will have a dark spot on the back of their head... which is just a remnant of their base color. And even tho their base color is covered up, the bird is still carrying the (dominant) genes for the color and the pearling. Pied is considered an incomplete dominant gene and only needs 1 copy to show up as a certain % of the hatch. But... Whites and Pieds are really a whole new subject, so I'll stop there.
I'm guessing the colors of guineas are dark being the most dom, and light being the least dom- everything else in the middle a crapshoot of co-domiance or something.
The crap shoot mainly comes into play from all the different unknown hidden color and hidden diluted color genes that are being carried. If both birds carry the same assortment of hidden recessive color genes, there's a chance they will pair up and produce lots of different colored keets... then whatever pearling genes are there in the mix will pair up and determine the pearling on each keet, no matter the base color. With genetically pure birds (which typical backyard flocks and swap meet birds are not), there really is no crap shoot, but even then natural mutations sometimes can occur just out of the blue.
Confused yet?
No, not as long as I focus on just Guinea genes, lol.
Basically, what I'm trying to ask-- if I take a non-pearled parent, and mate it to a fully pearled-- should that result in 100% partially pearled offspring, taking into account the fully pearled parent is pure for fully pearling, b/c the non pearled should be pure for recessive for both...
No, if you breed a non-pearled bird with a fully-pearled bird you will not get partially-pearled keets unless one or both parent birds are carrying the partially-pearled gene.
The partially-pearled gene is a separate gene all on it's own, it is not a combination of the fully-pearled and non-pearled genes. And it has to pair up with a 2nd copy of the partially-pearled gene or a copy of the non-pearled gene (that it is dominant over) to show up in the hatches.
Using cattle genes, that should be-- using what you told me above.. nope.
Like I said, they work differently.