Hi Graham,
While I agree with the basics of what you are saying,
that a yellow headed bird can carry a black gene, and it will only be in males.
I disagree that you can have yellow which is split for black, it will always be a RH which is split for BH which also has the 2 yellow genes attached and therefore will express the yellow colour.
As you would well know the Yellow gene is autosomal recessive, meaning that it merely co-exists with the other 2 head colours.
Therefore yellow can never exist on its own and can never be split for anything.
Gouldian head colour
- POLAR GOULDIANS
- ...............................
- Posts: 245
- Joined: 23 Jan 2009, 20:04
- Location: Central QLD
"Great minds discuss ideas. Average minds discuss events. Small minds discuss people." -- Eleanor Roosevelt
- Tiaris
- ...............................
- Posts: 3517
- Joined: 23 Apr 2011, 08:48
- Location: Coffs Harbour
Every Yellow-headed Gouldian male I have here (about 20 of them) is split to black-headed. I know this for certain because they all have a black-headed parent. I pair them up as if they are split to black-headed & they produce breeding outcomes as expected of YH split BH. They are YH not RH - I also have some RH males split to YH and BH. They also produce progeny "by the book" for that genotype.
- vettepilot_6
- ^^^^^^^^^^^^^^
- Posts: 2826
- Joined: 07 Aug 2011, 17:50
- Location: Childers
- Contact:
Thanks Graham ...thought I was going crazy...Tiaris wrote: ↑10 Dec 2017, 13:02 You can get Yellow split to black in males only as black is sex-linked recessive (so no female splits). These will have a red-tipped bill exactly the same as a pure black.
A yellow-billed black is actually a yellow and a black both occurring simultaneously in the same bird. In these, the darker black head colour totally masks any yellow on the head.
The Bitterness of Poor Quality Remains Long after the Sweetness of Cut Price is Forgotten