Frizzle Genetics Question!

[CaseyGentree]

Ok, think what you may about it. But wether or not a bird has frizzle feathers or not if it had been bred to a frizzle is DOES have the frizzle gene. I have bred two smooth feathered birds together to test this out myelf that came from frizzle breedings and some of the chicks came out frizzled even though the parents were both smooth. Thats how you can make any breed a frizzle, it has to carry the frizzle gene. For example if you wanted to have a silkie frizzle. Your fist hatch will not have silkie feathering just frizzle feathering, but if you continue to breed those birds over silkies eventually you would get a silkie with frizzled feathers because the parents carried both the frizzle gene and the silkie gene.

~Casey

 

[Sonoran Silkies]

Quote:
If you bred two smooths together and had frizzled offspring, you have just proven that your birds carry the frizzle modifier. If and only if a bird has two copies of the frizzle modifier gene can it hide the presence of the frizzle gene.

For a moment, let's pretend that the frizzle modifier gene does not exist, or if it does, iis not present at all in a flock. You will be able to tell which birds are F/F, which are F/f and which are f/f. Those who are F/F will be curlies--overly frizzled/frazzled birds. Those who are F/f will be normal frizzles and those who are f/f will not be frizzled. The following punnet squares show the possible matings and the predicted results of offspring.

CurleyXCurley 100% curley offspring
F F
F FF FF
F FF FF

CurleyXFrizzle 50% curley offspring; 50% frizzle offspring
F f
F FF Ff
F FF Ff

CurleyXNon-frizzle 100% frizzle offspring
f f
F Ff Ff
F Ff Ff


FrizzleXFrizzle 25% curley offspring; 50% frizzle offspring; 25% non-frizzle offspring
F f
F FF Ff
f Ff ff

FrizzleXNon-frizzle 50% frizzle offspring; 50% non-frizzle offspring
f f
F Ff Ff
f ff ff



Non-frizzleXNon-frizzle 100% non-frizzle offspring
f f
f ff ff
f ff ff


Okay, now let's consider the frizzle modifier gene--this gene "unfrizzles" a bird; however, as a recessive gene it has an effect only when the bird carries two copies.

A genetically frizzled bird (Ff) who has a double dose of this modifier gene will appear to not be frizzled; a genetically curley bird (FF) will appear to be frizzled (Ff), not curley.

If you mate a genetically frizzled bird (who appears to be non-frizzled due to a double dose of the frizzle modifier gene) to a genetically non-frizzled bird who does not carry the modifier gene, the offspring will receive only one copy of the modifier gene, thus turning OFF its frizzle reduction affect. Half the offspring will be frizzled, seemingly from a non-frizzle to non-frizzle mating.

 

[nzpouter]

Quote:
You really need to understand a few things.....

1) dominant vs recessive, frizzle vs silkie

2) read and try to understand other people posting before making yourself look ignorant.

10 years of breeding doesn't mean jack if you don't have the grasp of the simplest law of inheritance.

 

[jimnjay]

Sonora, Thank you for the excellent explanation I have been confused about the Modifier and it's relationship and when it will affect the outcome. Your patience in typing out all the potential offspring and the realtion of the modifying gene was very helpful.

I also really appreciate your respectful approach in explaining the genetics as they apply to Frizzles. Some of us are not well versed in genetics but have experince that we can share. I would certaily not wish to denigrate someone who wishes to share that expeience just because they are not well versed in making Punnet charts. Your effort to clarify the Issue is timely and very appreciated.

 

[Dipsy Doodle Doo]

Hi Andrew! That's my understanding and has been my experience with the Frizzle gene.

"Non-frizzle X Non-frizzle = 100% non-frizzle offspring"

Smooth x smooth (smooths from frizz x's) in my pens has resulted in all smooths.
It would be pillish if the F modifying gene was lurking about here.

Lisa

 

[TurtleFeathers]

Ok, I'm lost. I *think* I understand the whole concept of what Sonoran so kindly took the time to type out, BUT...

How do you know if a bird is genetically frizzled (Ff) but carries the frizzle modifier gene in a double dose? If you don't know the background of the bird in question, I suppose you just have to breed it and be surprised by frizzled offspring?

 

[Dipsy Doodle Doo]

Hi Kathy! I think you can disregard the 'modifying gene' as it is rare *unless you got birds from Casey*.

Lisa

 

[jenjscott]

But otherwise, turtlefeathers, yes, you would have to breed it .

 

[nzpouter]

Quote:
CORRECT!!!! Finally....

 

[nzpouter]

Quote:
A lot of test mating and eggs to be hatched... When you breed 2 frizzle (as in accepted look for a frizzle) together and you breed 100% normal "F/f look" then you will know your flock is F/F and mf/mf....