Curious question about pea combs. (might be a dumb question)

[Happy Chooks]

Trying to learn all this genetics stuff.

I've been reading the Olive egger thread where it states that the pea comb is closely tied to the blue egg gene. So I got to thinking about my LF light brahma that has a pea comb. So with brahma's the pea comb is not tied to the blue egg gene?

 

[FortWorthChicks]

I wondered that myself!

 

[Happy Chooks]

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Good, I'm not the only one.

 

[Lollipop]

Not true at all. The pea comb and its variations is indicative of oriental ancestry. The green/blue egg gene is dominant and can be passed on to offspring, regardless of parrentage on the other side. The lineage that gets credit for that gene is the Araucana, a South American breed originally and in it`s purest form sporting muffs and no tail (called "rumpless"). You`ll here and read all kinds of opinions on this, but look`m up if you`re interrested.........Pop

 

[saladin]

lollipop is right on the money! Peacombed displays Oriental ancestry. saladin

 

[Sonoran Silkies]

Peacomb gene and blue egg gene are indeed closely linked, but it does not matter which allele of which is linked together--they are usually inherited together. For example

If a bird carries a peacomb and a blue egg gene on the same chromosome, they are usually inherited together.
If it carries a peacomb and a not-blue egg gene on the same chromosome, they are usually inherited together.
If a bird carries a not-peacomb and a blue egg gene on the same chromosome, they are usually inherited together.
If it carries a not-peacomb and a not-blue egg gene on the same chromosome, they are usually inherited together.

About three percent of the time, a bird inherits these genes from separate chromosomes of one parent. If both parents are pure for both genes (P/P O/O), you will never see it. If a bird is pure for not-peacomb and not-blue egg (p/p o/o) you will also never see it. Likewise for P/P o/o and p/p O/O. However, if the parents are different from each other, or if one parent carries different genes you can see crossover in the offspring--if you hatch enough of them.

Say you bred a brahma (P/P o/o) to an ameraucana or araucana (P/P O/O). For convenience I am going to denote the genes a bit differently: P1/o1 P2/o2 for the brahma and P1/O1 and P2/O2 for the ameraucana. 97% of their offspring will inherit either

Brahma Ameraucana/Araucana (or even EE)
P1/o1 P1/O1,
P2/o2 P1/O1,
P1/o1 P2/O2 or
P2/o2 P2/O2

About 3% of the time a bird will inherit P1/o2, P2/o1, P1/O2 or P2/O1 from a parent; this is crossover. Once crossover has occurred, that bird's offspring will inherit that newly linked gene pair about 97% of the time.

 

[FortWorthChicks]

wow sanoran, Nice job explaining that!

 

[TK Poultry]

Sonoran sometime you blow my mind with your awesome genetic explantions!

 

[Happy Chooks]

Thanks so much for the explanation!

 

[The Sheriff]

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