BIRD OF THE WEEK # 28-29,Year 5

Rhasputin · Jul 21, 2011

Nancy C said:

Rhasputin, there are a bunch of different dilution genes. Some only work on certain types of pigment and some work on all of them.
Leucism doesn't mean the same thing that it did when I took genetics. Back then, we made a very clear distinction between leucism and the piebald factor because they are completely different alleles and an animal can have either, neither, or both. Nowadays leucism has come to mean anything that interferes with pigment structure or distribution, so it has become so broad a term that it is almost meaningless.

C-dilution, if it's what I think it is, is sort of a catch-all term for Color dilution. At least that's how it is in turkeys and some other things that I studied. "C" meaning full colored and dominant, and "c" meaning dilute colored and recessive.

On birds, most types of leucism are sex-linked, but most, if not all, of the piebald factors are not. That's why most of the wild dilute birds that are seen will be females. The most common form seems to be the type that dilutes normal melanin but doesn't affect phaeomelanin (a yellowish or reddish brown pigment) or caretenoid pigments as much, so the birds end up being sort of a fawn color and very prone to fading in sunlight. There is a much rarer version of leucism that does just the opposite, and it gives us things like silver wood ducks.
I will stop now .... before I type a whole book and bore everybody to death.
Click to expand...

Sex linked colour dilutions! Amazing!
In mice, the only sex linked colour, is X-brindle.

C dilutions refer to a dilution gene that is located on the C locus.

Thanks for the good info!!
Like I said, I don't know much about birds, just mice, so I'm learning.

Taxi-lover · Jul 21, 2011

Jim,love that goldeneye! Nice information too,this is one thing about learning in here! Thanks!

hop · Jul 22, 2011

Time for some smaller work...

hop · Jul 22, 2011

and a little bit bigger...

taxos · Jul 22, 2011

Hop, are you feeling poorly?an exotic White eye?

Peter Span · Jul 23, 2011

Nice stiffies. Since I'm running out of corvids I'm trying my luck with some owls ;D

Peter Span · Jul 23, 2011

Smaller

hop · Jul 23, 2011

feeling good Taxos, but out of (euro) work.... nothing new :'(
I would go doing owls too, Spanman, if I did them as good as you did you Athene!

irishme · Jul 23, 2011

MY FIRST GOLDENEYE

irishme · Jul 23, 2011

GOLDENEYE

irishme · Jul 23, 2011

GOLDENEYE

taxos · Jul 23, 2011

HOOT HOOT!

francois · Jul 24, 2011

Nice birdies Spanman, do you have a blue room

hop · Jul 24, 2011

next one for the museum (again working for others, while my Bubo is dehydrating in the freezer)

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BIRD OF THE WEEK # 28-29,Year 5

Rhasputin The Expert

Taxi-lover Active Member

hop Active Member

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hop Active Member

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taxos Finches, Buntings

Peter Span Corvids, gotta catch them all!

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Peter Span Corvids, gotta catch them all!

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hop Active Member

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irishme New Member

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irishme New Member

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taxos Finches, Buntings

francois Parrot collector

hop Active Member

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