I'm just curious, what would you get from a pairing of a yf1 and yf2? Because they are both dominant, you'd get some yf1's, yf2's, and no normals? Would any be both, yellowface1 and 2?

You would get mixes. It is advised not to mix the two as yf2 is considered a fault and dirties the Yf1 gene.

YF2 is dominant over YF1 so you would have all YF2

YF2 is dominant over YF1 so you would have all YF2

 

 

Okay. But a yf1 to a normal would have %50 normals and %50 yf1's, right?

yes as long as the white face was not a double factor YF1 and was a true white face

But even then the babies would all appear as half Yf and half normal. The 'normals' would just be DF Yf1.

But even then the babies would all appear as half Yf and half normal. The 'normals' would just be DF Yf1.

 

 

Um okay..now I am well and truly confused..how exactly does yf1 work??

What they are saying is you will get 50% yellowface and 50% white faced no matter what...

 

BUT, If you then breed the wf babies to blue normals and get some yellowfaced babies, you will know that the babies from this clutch are DF yf...

 

Did I confuse you more???

What they are saying is you will get 50% yellowface and 50% white faced no matter what...

 

BUT, If you then breed the wf babies to blue normals and get some yellowfaced babies, you will know that the babies from this clutch are DF yf...

 

Did I confuse you more???

 

Ah that did make a bit more sense. But, I still don't understand this...what is yf1.. that a yf1 when bred to a normal can get yf1's, single factor and double factor, and/or normals? I mean, it's not recessive but it doesn't sound like dominant.. it's just weird..Did that made any sense?

Edited January 16, 200916 yr by Jen144

that part I can't help you with I am really bad with dom rec genes... I know there is something in the FAQ's about it though so maybe check them out...

Okay I do understand dominant and recessive genes pretty much, it's just that the way you's described yf1 doesn't fit with either of those?

What they are saying is you will get 50% yellowface and 50% white faced no matter what...

 

BUT, If you then breed the wf babies to blue normals and get some yellowfaced babies, you will know that the babies from this clutch are DF yf...

 

Did I confuse you more???

 

Ah that did make a bit more sense. But, I still don't understand this...what is yf1.. that a yf1 when bred to a normal can get yf1's, single factor and double factor, and/or normals? I mean, it's not recessive but it doesn't sound like dominant.. it's just weird..Did that made any sense?

 

There are different genes that when doubled will erase the coloring/marking example the Spangle Gene when a bird is carrying 1 Spangle gene then you see the Spangle Markings but if the bird is carrying 2 Spangle genes then the bird will be all white or all yellow with iris rings and a blue cere this is called a Double Factor Spangle.

 

The same exact thing happens with the Yellowface Type 1 gene, when the bird is carrying 1 YF1 gene the bird will display on a blue bird a yellow face only but if the bird is carrying 2 YF 1 genes then the yellow is erased from the face and you will have a blue bird with a yellow face. Greens can also carry the Yellow Face Gene but because they have a base color of yellow and not white it is almost impossible to tell if they are carrying the gene.

 

I hope that makes more sense...

 

note this does NOT apply to the YF2 gene you can have a single or double but it won't have a white face.

What they are saying is you will get 50% yellowface and 50% white faced no matter what...

 

BUT, If you then breed the wf babies to blue normals and get some yellowfaced babies, you will know that the babies from this clutch are DF yf...

 

Did I confuse you more???

 

Ah that did make a bit more sense. But, I still don't understand this...what is yf1.. that a yf1 when bred to a normal can get yf1's, single factor and double factor, and/or normals? I mean, it's not recessive but it doesn't sound like dominant.. it's just weird..Did that made any sense?

 

There are different genes that when doubled will erase the coloring/marking example the Spangle Gene when a bird is carrying 1 Spangle gene then you see the Spangle Markings but if the bird is carrying 2 Spangle genes then the bird will be all white or all yellow with iris rings and a blue cere this is called a Double Factor Spangle.

 

The same exact thing happens with the Yellowface Type 1 gene, when the bird is carrying 1 YF1 gene the bird will display on a blue bird a yellow face only but if the bird is carrying 2 YF 1 genes then the yellow is erased from the face and you will have a blue bird with a yellow face. Greens can also carry the Yellow Face Gene but because they have a base color of yellow and not white it is almost impossible to tell if they are carrying the gene.

 

I hope that makes more sense...

 

note this does NOT apply to the YF2 gene you can have a single or double but it won't have a white face.

 

 

I understand all of that, except for the parts I put in bold..You're saying a sf yf1 will be a blue bird with a yellow face, but a df yf1 is a blue bird with a yellow face?

But in a previous thread when I asked about the yf2 gene, everyone said df yf2 is a blue bird with a white face....

Now I am more confused...lol

The same exact thing happens with the Yellowface Type 1 gene, when the bird is carrying 1 YF1 gene the bird will display on a blue bird a yellow face only but if the bird is carrying 2 YF 1 genes then the yellow is erased from the face and you will have a blue bird with a yellow face. Greens can also carry the Yellow Face Gene but because they have a base color of yellow and not white it is almost impossible to tell if they are carrying the gene.

 

note this does NOT apply to the YF2 gene you can have a single or double but it won't have a white face.

 

Where I have underlined Elly made a mistake. She was meant to write White face.

 

A yellow face type 1 bird is a bird with yellow only on the mask.

A yellowface type 2 bird is a bird where the yellow bleeds into the body colour.

 

The genes work slightly differently.

 

In Yellowface type 1.

A bird carrying no YF1 genes has a white face

A bird carrying 1 YF1 gene has a yellow face

A bird carrying 2 YF! genes has a white face

 

In Yellowface type 2

A bird carrying no YF2 genes has a white face

A bird carrying 1 YF2 gene has a yellow face

A bird carrying 2 YF2 genes has a yellow face (its yellow on its body is more mottled)

 

This is the general consensus. I am still finding the details to be a bit fuzzy.

 

Side note: Spangle is not the typical Somatic Dominant. I believe that it is actually codominant, which works a different way. A dominant gene should phenotypically present the same when an animal has 2 genes as when it has one. Spangle does not adhere to this rule and it, along with dark factors, grey factors and violet factors all work codominantly.

The same exact thing happens with the Yellowface Type 1 gene, when the bird is carrying 1 YF1 gene the bird will display on a blue bird a yellow face only but if the bird is carrying 2 YF 1 genes then the yellow is erased from the face and you will have a blue bird with a yellow face. Greens can also carry the Yellow Face Gene but because they have a base color of yellow and not white it is almost impossible to tell if they are carrying the gene.

 

note this does NOT apply to the YF2 gene you can have a single or double but it won't have a white face.

 

Where I have underlined Elly made a mistake. She was meant to write White face.

 

A yellow face type 1 bird is a bird with yellow only on the mask.

A yellowface type 2 bird is a bird where the yellow bleeds into the body colour.

 

The genes work slightly differently.

 

In Yellowface type 1.

A bird carrying no YF1 genes has a white face

A bird carrying 1 YF1 gene has a yellow face

A bird carrying 2 YF! genes has a white face

 

In Yellowface type 2

A bird carrying no YF2 genes has a white face

A bird carrying 1 YF2 gene has a yellow face

A bird carrying 2 YF2 genes has a yellow face (its yellow on its body is more mottled)

 

This is the general consensus. I am still finding the details to be a bit fuzzy.

 

Side note: Spangle is not the typical Somatic Dominant. I believe that it is actually codominant, which works a different way. A dominant gene should phenotypically present the same when an animal has 2 genes as when it has one. Spangle does not adhere to this rule and it, along with dark factors, grey factors and violet factors all work codominantly.

 

 

Alright, that made a lot more sense. Thanks. The only way you can really tell if they are double factor yf2's is if they bred to a normal and produce 100% yf2's, and same with df yf1's (that look like whitefaces) right?

Right.

 

Both Yellowface DF when crossed with a normal will produce all yellow faced babies that are single factor .

Pairing a type 1 yellow face with a type 2 yellow face you would get 25% type 1, 25% type 2, 25% normal white face and 25% combinations of the two yellow face types. The combinations would look like type 2's because the type 2 would mask the type 1. The mutation would be masked not split. You would not get double factors of either type. The only way to tell which ones were combinations would be to mate them to a normal and see if they produced both types

Edited January 16, 200916 yr by Neville

Pairing a type 1 yellow face with a type 2 yellow face you would get 25% type 1, 25% type 2, 25% normal white face and 25% combinations of the two yellow face types. The combinations would look like type 2's because the type 2 would mask the type 1. The mutation would be masked not split. You would not get double factors of either type. The only way to tell which ones were combinations would be to mate them to a normal and see if they produced both types

 

 

Ahh okay thank you Nev.

Neville is the Genetics guru so I'll agree with him I have no idea with percentages...

thanks for fixing that for SW, it was late.

So therefore Neville the big question is: Are yellow face type 1 and type 2 on the same chromosome or are they separate?

So therefore Neville the big question is: Are yellow face type 1 and type 2 on the same chromosome or are they separate?

It's my understanding that they are separate

Interesting, so if that is the case, a Yf2 is not a fault of Yf1, it is an entirely different gene.

 

Wouldn't it make more sense if the different yellowface types would be different alleles of the same gene. (I have no idea how they work, just theorising here), or at least on the same chromosome? It is hard to tell without actually writing up the genome for a white face, a YF1, YF2 and a GF as phenotypically they overlap each other. Which we all know hasn't happened yet. They probably haven't even got the genome of a budgie yet.

they should do that... it would be great... it is something I have thought about. There are a lot of fanciers out there that have lots of information but I don't know of any real scientific studies that have been done on the beloved budgerigar...