comb genetics question........

[klf73]

I have lavender EE's. They have pea combs. I want to use one of them to develop the lavender in a single comb breed. What could I expect in the F1 generation as far as comb? How long would it take to breed the pea combs out? Any info appreciated...........thanks

 

[LilPeeps]

Single comb is recessive, so you could get 50% sc, 50% het for sc, in f2, if f1 is bred back to a sc bird..if you breed f1 x f1, you will get 25% without the sc gene, 50% het for sc, and 25% sc.

 

[onthespot]

Pea comb is easy to breed out in two generations. Once you have single combs and breed single combs to single combs, you will never see pea combs again unless you cross it into the line.

 

[Guinea Goonie]

This may be helpful:

https://www.backyardchickens.com/web/viewblog.php?id=9280-Comb_Genetics

Genetics of chickens can get pretty complicated.

Here is a link to some basic chicken genetics:

http://home.ezweb.com.au/~kazballea/genetics/theory.html#gen_theory_intro

A chicken has 78 chromozomes. Humans have 46.

The chicken is really an amazing creature.

 

[Byrdj]

Since the blue egg gene is tied so closely to the pea comb gene, if you breed out the pea comb you will also breed out the blue egg gene. The egg color will then be either brown or white, depending on which trait was carried from the single comb birds used in breeding. If someone who knows more about genetics than me,
feel free to correct me if I am wrong.

 

[onthespot]

what she is breeding for, she doesn't want the blue egg gene, so it would be a plus if it disappeared completely in two generations.

 

[tadkerson]

If you breed a pea comb with a single comb, you will get heterozygous (hybrid or split) offspring. The pea comb is incompletely dominant so you will get something in between a pea comb and a single comb. I have raised a bunch of the heterozygotes and every one had a funny looking floppy comb.

It has been my experience ( this is anecdotal) that single combed birds carry modifiers of the comb- these modifiers effect the size of the single comb. I believe they also effect the appearance of the pea comb. These modifiers appear to be dominant. If you breed the pea comb to a breed that has a large comb - you may have to also breed out the modifiers. I worked with pea comb and leghorns.

BYRDJ is correct. The pea comb gene is closely linked to the blue egg gene; about 3 map units. You have 3 chances in one hundred ( that is if a bird is heterozygous or split for single comb and pea comb) of producing a bird that is single combed and lays a blue egg.

Tim

 

[onthespot]

my hen is heterozygous for the pea comb gene, but the only pic I have of her on this computer shows it looking pretty straigh. It isn't it flops over toward her left eye a bit, and the "peas" are uneven.