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

Discussion in 'General breed discussions & FAQ' started by Happy Chooks, Jan 26, 2010.

  1. Happy Chooks

    Happy Chooks Moderator Staff Member

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    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?
     
  2. FortWorthChicks

    FortWorthChicks Chillin' With My Peeps

    Nov 21, 2009
    Fort Worth
    I wondered that myself!
     
  3. Happy Chooks

    Happy Chooks Moderator Staff Member

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    Quote:Good, I'm not the only one. [​IMG]
     
  4. Lollipop

    Lollipop Chillin' With My Peeps

    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
     
  5. saladin

    saladin Chillin' With My Peeps

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

    Sonoran Silkies Flock Mistress

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    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.
     
    Last edited: Jan 26, 2010
  7. FortWorthChicks

    FortWorthChicks Chillin' With My Peeps

    Nov 21, 2009
    Fort Worth
    wow sanoran, Nice job explaining that! [​IMG]
     
  8. TK Poultry

    TK Poultry Chillin' With My Peeps

    May 25, 2009
    Greencastle, Indiana
    Sonoran sometime you blow my mind with your awesome genetic explantions!
     
  9. Happy Chooks

    Happy Chooks Moderator Staff Member

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    Thanks so much for the explanation!
     
  10. The Sheriff

    The Sheriff Overrun With Chickens

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    Press 1 if you'd like to hear this message in English. [​IMG]

    Quote:
     

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