Genetic Expressions

 

This shows which genes are expressed or visual and which aren’t. Single factor means the bird has one copy of the gene, double factor means the bird has two. (a) means that the bird has only one gene. (a x 2) means the bird has two times the same gene. (a + x) means the bird has two genes but they are different.

 

 

Autosomal Dominant

1 Dominant gene: Yes >single factor<

2 Dominant Genes (a x 2): Yes >double factor<

2 Dominant Genes (a + x): Sometimes 25% both expressed, 25% a

expressed, 25% x expressed, 25% neither one expressed

>single factor unless neither one is expressed<

 

Sex-Linked Recessives

Males

1 sex-linked recessive (a): No, but split

2 sex-linked recessive (a x 2): Yes

2 sex-linked recessive (a + x): no, both splits

 

Females

1 sex-linked recessive (a): yes

 

Autosomal Recessive

1 recessive gene (a): no, split

2 recessive genes (a x 2): yes

2 recessive genes (a + x): no, both splits

 

 

i hope this is all right if i made a mistake, please correct me

Edited May 10, 200718 yr by Marlony

Remember i asked questions in "Some Genetic Question" and then in "Calculating the Percentage...I went to some websites that told me autosomal dominant and recessive. And the a and x idea i got from my mom because shes a mathamatician. It took my like an hour to do. Then I made this to help people figure out when something is visual and when hidden or not expressed.

Edited May 12, 200718 yr by Kaz

Very Well done Marlony, I am very impressed.

thanks so much Daz!!!!

Edited May 11, 200718 yr by Marlony

I have never heard it explained that way.. I even had to head back to the books. :budgiedance:

 

I had to think about

"2 Dominant Genes (a + x): Sometimes 25% both expressed, 25% a

expressed, 25% x expressed, 25% neither one expressed

>single factor unless neither one is expressed<"

 

But can relate to a Dominant Pied Spangle which is in fact carrying two dominant genes but both diferent and can only be single factor and not double factor.

:budgiedance: Yes it is a different way to look at it but the end result is the same. I had to read it a few times over to connect the dots (so to speak).

 

 

In the end if it helps you and others understand the fun game called budgie genetics then great :sad:

Daz, i dont quite get what your saying...

2 dominant (a + x) means that there are two dominant genes that are diffrent. Thats what a dominant pied spangle is isnt it? and i believe there are df spangles and df dominant pieds???

If you mate a double factor dom pie to a double factor spangle =100%

SF spangle dom pie.Mate a double factor spangle to Sf dom pie =50%

spangle,50% spangle dom pie.

Daz, i dont quite get what your saying...

2 dominant (a + x) means that there are two dominant genes that are diffrent. Thats what a dominant pied spangle is isnt it? and i believe there are df spangles and df dominant pieds???

 

Is thats right. What I was saying is that like Nerwen I was trying to get my head around the configertations you were using.

 

Now (a + x) being two dominant genes of diferents type. My example was the Dominant pied Spangle. These are two dominant gens in the same bird.

 

But a Macka said you can't had Double Factor dominant genes of different type in the same bird.

 

I was just agreeing with your analigy and giving an example. :budgiedance:

Genetic Expressions

 

2 Dominant Genes (a + x): Sometimes 25% both expressed, 25% a

expressed, 25% x expressed, 25% neither one expressed

>single factor unless neither one is expressed<

 

 

My brain is literally hurting right now (I've got a pretty bad headache), so trying to figure this out is just not working..

 

Can some please explain the above 'equation' to me please??

 

I thought that if a bird have two different dominant genes, both will express 100% of the time.

No matter which way I look at it, I just don't see how there's a 25% chance of only one dominant gene expressing. Or even 25% chance of it not showing at all?!?!? dominant gene?

 

eg... a green and grey gene - grey green bird. Dom pied gene and spangle gene - dom pied spangle bird, green and spangle - green spanglebird, grey and spangle - grey spangle bird.

 

Am I missing something while I'm having this really bad headache??

 

 

And also what about if you have double factor genes which is possible as well like (aa + xx). eg 2 dark factor gene and 2 dom pied gene... Olive dom pied??

 

 

But can relate to a Dominant Pied Spangle which is in fact carrying two dominant genes but both diferent and can only be single factor and not double factor.

 

Daz, just curious, are you saying that a double factor spangle can't mask dom pied gene? I thought that they use different gametes? wouldn't that allow it? I'm soooo confuse right now!!! :budgiedance:

http://forums.budgiebreeders.asn.au/index....picture=14887&st=20

i asked that question too. check out the second page where i posted

"okay, so what if you have a sf spangle and sf domiannt pied, would you get 100 percent dominant pied spangles??"

No not nessacary it depends on the strength of the genes.

For example SF Spangle to SF Spangle gives 25% DF Spangle 50% SF Spangle and 25% Normal. I have had 13 chicks from this pairing with only 1 df Spangle.

 

SF Spangle to normal should give 50% Spangle 50% Normal but many breeders may not get 1 spangle from this pairing all season..

 

The selections are only for a perfect world over hundreds of pairings.

 

You could find that SF Spangle to SF Dominant Pied could give normals, Spangles, Dominant pieds and Dominant Pied Spangles..

Edited May 13, 200718 yr by Daz

I have put together a

 

SF YFT2 dom pied spangle X SF dom pied spangle...and got..........

DF spangles,

SFspangle dom pieds,

and of couse I got 1 normal YF

This is Mum and Dad

 

These guys are sibblings..

 

He doesn't even have the pied spot..

 

But I do wonder if My DFS mask the dom pied!

Edited May 14, 200718 yr by Lady

But I do wonder if My DFS mask the dom pied!

 

 

umm now there's a thought. Cn a bird carry three dominant genes. I don't think so but I could be wrong.

Nerwen?

http://forums.budgiebreeders.asn.au/index....picture=14887&st=20

i asked that question too. check out the second page where i posted

"okay, so what if you have a sf spangle and sf domiannt pied, would you get 100 percent dominant pied spangles??"

 

HUH?? are you saying that in your original posts, (a + x) actually means two different birds?? you mean if Bird 1 having the 'a' gene and bird 2 having the 'x' gene? because my understanding was your original posts makes a whole lot of sense if it was 'A BIRD'... of what shows and what doesn't.. and if it's not what you mean, then you're missing a whole lot of other combination possible. I hope you know what I mean.

 

(a x 2) means the bird has two times the same gene. (a + x) means the bird has two genes but they are different.

I just read your original post again... and this is what I read... and to me, that means that your original post 'equations' were in fact refering to 1 bird only, and if that's so, that would mean that if birds are (a+x) then it would express (a+x) in the dominant trait.

Edited May 14, 200718 yr by Cheeta

Cn a bird carry three dominant genes. I don't think so but I could be wrong.

 

Why not Daz? As long as they are all on different alleles. Lady above has a YF dom pied spangle... all dominant factors.

 

 

Feathers.

guys, good job I am soo lost!!! (completely) lost!!!

 

i think ill do the dominant section again.

If i understand what you guys are saying, if the budgie has 2 dominant gene. I have to say if single factor or double factor... and ill also do a section with three dominant genes, if its possible.

So is 3 dominant genes possible?

 

i should have never started this topic! (Laughing out loud)

 

Cheeta a + x: its all about one bird, just the amount of genes...

Edited May 14, 200718 yr by Marlony

birds can carry different domanint genes as long as they don't share the same allele from what I understand.

 

I do believe this is getting more complicated then needed.

 

What was the point of doing the chart? If it was for expections there are awesome sites that you can use for expections too . makes it much easier.

Cheeta a + x: its all about one bird, just the amount of genes...

 

well in that case, both 'a' and 'x' will show 100% of the time.