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Kindly approved by Koolie Club of Australia Gene effects

10-Apr-2007

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Listed here are some of the Genes that are being researched, that may influence the Koolie.

Of all the characters in the dog, coat color inheritance is among the best understood. It is, however, complex and involves at least ten genes, some of which are multi-allelic (occur in more than two alleles, or forms). There is some disagreement about the multi-allelic genes but, over all, most are clearly defined and undisputed.

  • B: This gene has two alleles.
    B - dominant black. This allele allows black to be expressed (wherever expected) and always gives a black nose.
    b - recessive, inhibited-black. This allele results in chocolate brown (wherever expected) and always gives a brown or liver nose.
  • DILUTION: This gene has two alleles.
    D - results in normal pigment.
    d - diluted pigment; that is, changes black into blue, or chocolate into fawn.
  • MERLE: This gene has two alleles.
    M - merle, having basic color blotched with darker color (black or red).
    m - normal color.

    In breeds where M occurs, the Mm dog is merle in color. MM is a semi-lethal combination. MM dogs will be predominantly white, blind and weak in constitution.  

    Historically the word "merle" was used to describe "marbled (mottled, ticked, flecked)" coat colors.

  • ALBINO: This gene has four alleles.
    C - dominant for the production of pigment (melanin). Also called "coloured".
    cch - chinchilla or partial albinism.
    cd - white coat with dark eyes and nose.
    ca - albino, with no pigment, white coat, pink nose and skin, pink or blue eyes.

 

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