Egg color genetics

Discussion in 'General breed discussions & FAQ' started by oaklandmama, Jul 21, 2011.

  1. oaklandmama

    oaklandmama Out Of The Brooder

    47
    0
    22
    Jul 20, 2011
    Oakland, CA
    Hi out there,

    Have a question for the genetics experts... If I have a blue egg laying easter egger and breed it with a white egg layer, there are two possible scenarios--50/50 blue/white or all blue. Am I right?

    What happens if I breed that same easter egger to a brown layer? Is it 50/50 green/brown or all green?

    Am I totally misunderstanding it?

    Thanks for the help!

    Jisun
     
  2. DAFox

    DAFox Chillin' With My Peeps

    382
    6
    111
    Nov 7, 2009
    SW MO in Vernon Co
    My Leghorn/EE lays a pale green egg. Her mother lays a mint green egg.
    Dale-Ann
     
  3. Henk69

    Henk69 Chillin' With My Peeps

    1,759
    37
    183
    Nov 29, 2008
    Groesbeek Netherlands
    The peacombed ones should lay blue (or green) eggs. The non peacombs should lay white or brown eggs.
    The latter are absent if the blue egger is pure.
     
  4. oaklandmama

    oaklandmama Out Of The Brooder

    47
    0
    22
    Jul 20, 2011
    Oakland, CA
    Hm. I'm confused. Having pea combs affects egg color? Sorry for my complete ignorance...!
     
  5. Henk69

    Henk69 Chillin' With My Peeps

    1,759
    37
    183
    Nov 29, 2008
    Groesbeek Netherlands
    Peacomb gene and blue egger gene are linked [​IMG]
     
  6. oaklandmama

    oaklandmama Out Of The Brooder

    47
    0
    22
    Jul 20, 2011
    Oakland, CA
    My cursory internet research definitely didn't reveal that. Thanks so much!

    Jisun
     
  7. nicalandia

    nicalandia Overrun With Chickens

    6,337
    315
    288
    Jul 16, 2009
    Quote:but they can Also Cross and be linked to Single Comb... But the odds are not in your favor...[​IMG]

    Nice to see you here doing your think Mr. Henk(Teaching younlinks like me)
     
  8. tadkerson

    tadkerson Chillin' With My Peeps

    1,984
    120
    204
    Jul 19, 2008
    Missouri
    Quote:Genetics 101

    It has been my experience that crossing a purebred blue egg layer with a white egg layer (white leghorn) will produce blue egg layers but the color will suffer. The color will be a light blue. The leghorns ( and most likely other white egg layers) carry genes or a gene that reduces non white color.

    heterozygous blue egg shell (O/o+) x homozygous white egg shell (o+/o+) = 50% O/o+ and 50% o+/o+ ( just like the parents)

    homozygous blue egg shell (O/O) x homozygous white egg shell (o+/o+) = 100% O/o+ (blue egg shell)

    Brown egg shell is a polygenic trait or in other words the trait is caused by a number of genes- could be a number of genes greater than 10-not much research on the topic. You also have to remember brown egg shell birds carry two alleles (genes) for white egg shell.

    Green egg shell is a combination of blue egg shell and a brown egg shell. The blue pigment is added to the shell while the brown pigment is normally added on the surface of the shell.

    In genetics, the green egg shell is a complementary trait. Complementary refers to genes that work together to produce a third phenotype ( in this case green egg shell).

    This is different than incomplete dominance- incomplete dominance deals with a dominant and a recessive allele.


    Crossing a homozygous blue egg shell (O/O) X brown egg shell (o+/o+) with brown egg shell genes = heterozygous blue egg shell O/o+ with brown egg shell genes (a green egg shell)

    heterozygous blue egg shell (O/o+) X brown egg shell (o+/o+) with brown egg shell genes= brown egg shell (o+/o+) with brown egg shell genes, and heterozygous blue egg shell O/o+ with brown egg shell genes (a green egg shell)


    Tim
     
    Last edited: Jul 22, 2011
  9. oaklandmama

    oaklandmama Out Of The Brooder

    47
    0
    22
    Jul 20, 2011
    Oakland, CA
    Ok, not in my original post, but how do speckles work?
     

BackYard Chickens is proudly sponsored by