For a bird to be a recessive type it needs both genes. If it only has one gene it is said to be split to that gene.

 

A bird to be dominant needs only one of the genes.

 

EG Spangle - Dominant Gene. Only one required.

 

Spangle Cock Xs X is paired to a normal hen X Y (no I won't use the wild symbol)

 

Out come.

 

Xs X ... Xs Y ... X X ... X Y

 

As you can see the possible outcome is:

Xs X Spangle Cock.

Xs Y Spangle Hen

X X Normal Cock

X Y Normal Hen.

 

We actually say the 50% will be Normal and 50% will be Spangle

 

EG Greywing - Recessive Gene two genes required

 

Greywing Cock. X Xdil*g is paired to a normal hen X Y

 

Out come.

 

X X+dil*g ... X Y+dil*g ... X X+dil*g ... X Y+dil*g

 

Cocks and Hens Split to Grey Wings.

If the Hen was split Greywing. X Y+dil*g lets see what happens.

 

 

Greywing Cock. X Xdil*g is paired to a normal/greywing hen X Y+dil*g

 

Outcome

 

X Xdil*g ... X Ydil*g ... X X+dil*g ... X Y+dil*g

 

50% of the cocks and hens would be Greywings and 50% would be split.

 

EG Opaline - Sex Linked. Cocks need two genes to show. Hens need one Gene to show. The Sex gene is carried on the X chromosome.

 

Normal Cock X X with Opaline Hen Xop Y

 

Out come

 

X Xop ... X Y ... X Xop ... X Y

 

Cocks will be Normal split opaline. Hens will be normal.

 

If the cock was split to Opaline Xop X to Opaline Hen Xop Y

 

Out Come

 

Xop Xop ... Xop Y ... X Xop ... X Y

 

25% Opaline Cocks.

25% Opaline Hens

25% Normal/opaline Cocks

25% Normal Hens.

Edited May 4, 200718 yr by Daz

Daz, This is why I use the budgie breeding program. These xyz genes,I havent got a clue.They make my

head hurt just thinking about it.

I started with Bird tracker that does it too, but soon learnt the basics. I have a lot of genetic information that I have down loaded and spend time reading.. Nerwen has taught me as well

 

Information on the Sex linkage.

ELEMENTARY SEX LINKAGE

Edited May 4, 200718 yr by Daz

:sad: thank daz.

 

Marlony are you REALLY confused now? Sometimes it help to focus on one thing and understand that before moving on.

 

It may help to remember to think like this:

SeX linked gene are carried on the X chromosomes.

Good point Nerwen.. I didn't think of that one...

so guys can only have one sex-linked gene? And females 2?

 

Boys have 2 since they have 2 xx

Girls have 1 snce they only have 1 x and the y carries no mutation information

 

Nerwen LOVE it!

okay. so if sex-linked genes are carried on the x chromosome where are dominant and recessive genes carried?

Edited May 6, 200718 yr by Marlony

other chromosomes that have nothing to do with determining sex of a bird.

okay. I think i get it.

 

one more question, just kidding probably 1000.

 

If a male budgie has two sex-linked genes that are diffrent, none of them are visual or expressed, which would make both splits?Is that right?

Both would be split. You could have a Light green normal Split to Opaline split to Cinnamon split to Recessive Split to Blue.

 

So you have what looks like a normal Light green bird but when paired can give Cinnamon hens, Opaline Hens, Opaline Cinnamon Hens.

 

If paired to a recessive or a split recessive can give Recessive Cinnamon Hens, Recessive Opaline Hens, Recessive Opaline Connamon hens.

 

If paired to a blue or another green split to blue you could get Blue birds in the above varieties.

 

This is why records of breeding is very inportant in Breeding Show Birds and why we don't colony breed.

Edited May 6, 200718 yr by Daz

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

Marlony.25% Spangle Dom pie.25% Dom Pie.25% Spangle.25% Normal.

oh i see.

 

waht if a budgie has two diffrent dominant genes: single or double factor???

 

i dont know if i asked this before but can a budgie have more than two dominant genes and more than 2 recessive genes?