Is blue incomplete dominant or codominant?

Discussion in 'General breed discussions & FAQ' started by chickNjake, May 5, 2009.

  1. chickNjake

    chickNjake Songster

    Sep 3, 2008
    east tn
    I feel silly asking this, being around the gene so long, but is Andalusian blue incomplete dominant or codominant? I've been researching it and found both. I know all about the percentages of BBS and everything.

    I'm doing a report on genetics and i thought I'd use what I'm familiar with; chickens! [​IMG]
    I was thinking incomplete but i really have no idea [​IMG] thanks!

  2. Krys109uk

    Krys109uk Songster

    Blue is incompletely dominant. Incomplete dominance is when the heterozygote is an intermediate of the two alleles. Co-dominance is when both alleles express themselves fully. [​IMG]
  3. Sonoran Silkies

    Sonoran Silkies Flock Mistress

    Jan 4, 2009
    Tempe, Arizona
    What are some co-dominant genes?
  4. chickNjake

    chickNjake Songster

    Sep 3, 2008
    east tn
    Quote:I was also wondering this, I know blood type is a favorite A+B=AB.
    it seems like every sort of material I find on co-dominance has chickens as an example, it says black X white = speckled, which I am confident is not correct, so I cannot trust the other info. [​IMG]
  5. tadkerson

    tadkerson Songster

    Jul 19, 2008
    I do not know of any genes that deal with morphology that are codominant in chickens.

    On the cell level, there are traits that are codominant. Take for example henny feathering, this is a sex-limited trait found in chickens. Males do not have estrogen (a female hormone) in their skin and so they have male type feathering. Females have estrogen in their skin therefore they have hen feathering.

    On the cell level, henny feathered males that are heterozygous have an allele that does not covert male hormones to estrogen and an allele that does covert the male hormone to estrogen. This is codominance on the cell level because both alleles are turned on and functioning.

    The enzyme aromatase is responsible for converting the male hormones to female hormones. Female chickens actually make male hormones then convert the male hormones to estrogen. Males that are heterozygous for henny feathering have both male and female hormones in their skin, the female hormones win the battle and cause the production of henny feathering.


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