comb genetics

[syble]

i haven't found a good page on comb genetic yet. single comb is recessive to other comb types from the one thing i read. what is dominant over say a pea comb?
Thanks
Sib

 

[sjarvis00]

Quote:
Rosecomb..

 

[Sonoran Silkies]

Quote:
Rosecomb..

No. Pea comb and rose comb are separate genes, that combine to create a walnut comb. Both are dominant genes. The recessive allele is the lack of pea comb or the lack of rose comb. There are also several other comb genes: trifid, V-comb, breda and some genes that modify the comb, such as making the surface smooth or spikey.

 

[tadkerson]

Quote:
Combs are complicated because of epistasis. I do not know how rose comb or pea comb interacts with duplex comb but I would imagine rose comb and duplex comb modify each other and so does pea comb and duplex comb. I will find out in the near future about rose comb and duplex comb. I plan on doing some test crossing.

Rose comb gene (R) is epistatic to all single comb genes- p+, d+ and dominant to the r+ allele

Pea comb (P) is incompletely dominant to p+ allele. And epistatic to the d+and r+ genes

Pea comb gene + rose comb gene = walnut comb both genes modify the expression of the other gene producing a third phenotype walnut comb

Duplex comb Dv is incompletely dominant to the d+ allele and dominant to the Dc allele and d+ allele.

duplex comb ( both v and buttercup) + rose comb =modified rose comb ( hypothetical) The Dc allele may show low percentages of penetrance

duplex comb ( both v and buttercup) + pea comb =modified pea comb ( hypothetical) The Dc allele may show low percentages of penetrance

duplex comb ( both v and buttercup) + rose comb+ pea cob = modified walnut comb (hypothetical) The Dc allele may show low percentages of penetrance


More later got to go to work


Tim

 

[syble]

wow, that was over my head some... i have a breeding project in mind. to acomplish what i want, I have to take my base which is a pea comb and breed it either to a single comb or a rose comb. I just want something that i can breed out quicker. single comb i have been told is recessive to pea comb, so it would take a lot of test matings to make sure it was gone. if i understand right, rose comb if they carry it will be visible, so the entire f1 cross would be junk after i get some f2 as about 50% of those should be rose comb free yes?
Thanks
Sib

 

[tadkerson]

Quote:
Genetics 101

The following will occur if all the organisms are purebred for rose or pea comb.

pea comb X rose comb= F1 walnut comb offspring

pea comb X single comb= F1 modified single comb ( weird looking comb) offspring

What are you crossing? What you do next depends on the variety of chicken you want to produce.

Tim

 

[Chris09]

I would like to add -
Rose Comb x Single Comb = F1 Rose Comb
F1 Rose Comb x Single Comb = a very narrow Rose Comb that tends to be over sized in height you will also get very wide somewhat short Single Combs.

* If fowl are pure for comb type.

Chris

 

[Zombat]

Can anyone provide any pictures of R + Dv or R + Dc cockerels?

Thanks

 

[Henk69]

Pure D^v/D^v should look the same either what other comb genes (rose/pea) are present except for pure Breda Bd/Bd, which would be combless. Breda fowl probably are such (large nostrils).
The D^v/D^v would have reduced comb mass and would look like the typical V-shape comb.