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Color Inheritance

Discussion in 'Doberman Breeders' started by Silent, Feb 1, 2009.

  1. Silent

    Silent Novitiate

    Someone recently ask what color pups could be produced by breeding two black parents. They did not understand the DPCA color chart so I thought this would help them. The color chart can be found at http://www.dpca.org/color.chart.5.html

    When you look at a black Doberman you are seeing the dogs phenotype. This is what is visible to the eye.
    Dogs also have a genotype. The genotype can contain recessive or hidden genes not visible when you look at the dog, but these hidden genes can be passed down to the next generation.

    The color black is represented on color inheritance charts as B, the recessive red color is represented as b.
    Non-dilution is represented as D, dilution is represented as d.
    Black is dominant over red, a single black (B) gene can hide a red (b) gene.
    Non dilute is dominate over dilute, a single non dilute (D) gene will hide a dilute (d) gene.

    A black dog can be:
    BBDD black does not carry for red or dilute,
    BBDd black does not carry for red does carry for dilute,
    BbDD black does carry for red does not carry for dilute,
    BbDd black does carry for red and carries for dilute.


    In all cases what you will visibly see is a black dog.

    If a single dominate gene is present as well as the recessive gene (either Bb for black or Dd for non-dilute) the red and/or dilute gene will not show.
    Red and dilution are autosomal recessive genes; both parents have to contribute the recessive gene so that the dog gets two copies of it for it to be expressed.

    If for example a visibly black dog carries for red and dilute they would be genotype BbDd.

    If this dog is bred to a black dog who is BBDD (no red, no dilute), one red gene and one dilute gene *could* be passed from the BbDd parent. Since the BBDD parent can not contribute a matching recessive gene all pups would visibly be black. Some *could* however carry the red gene and/or the dilute gene from the BbDd parent.

    If the black BbDd dog is bred to a black that carries red but not dilute BbDD, pups could get a copy of the red (b) gene from both parents producing a red pup (bbDD or bbDd). It would not however produce any dilute pups. Some of the puppies could get a single copy of the dilute gene (d) from the BbDd parent but without the matching gene from both parents, it would not be visibly expressed.

    In this breeding you could produce
    Blacks that do not carry red or dilute (BBDD)
    Blacks that carry for dilute (BBDd)
    Blacks that carry for red and dilute (BbDd)
    Red that do not carry for dilute (bbDD)
    Red that carry for dilute (bbDd)

    If the black dog (BbDd) is bred to another black that carries for red and dilute (BbDd) then pups could inherit both the recessive red and or recessive dilution from both parents producing all four colors.

    Blacks that do not carry red or dilute (BBDD)
    Blacks that carry for dilute (BBDd)
    Blacks that carry for red but do not carry for dilute (BbDD)
    Blacks that carry for red and dilute (BbDd)
    Blue that does not carry for red (BBdd)
    Blue that does carry for red (Bbdd)
    Reds that do not carry for dilute (bbDD)
    Red that carry for dilute (bbDd)
    Fawn (bbdd)

    To produce a red the dog has to get the recessive red gene (b) from both parents.
    To produce a dilute the dog has to get the recessive dilution (d) gene from both parents.

    If both parents are black and do not carry for red or dilute (BBDD) you would only produce pups that are black who do not carry for red or dilute.

    If both parents are black and carry dilute but neither carry for red (BBDd) you can get
    Blacks that do not carry red or dilute (BBDD)
    Blacks that do not carry red but do carry for dilute (BBDd)
    Blue (BBdd)

    Blue is black diluted
    Fawn is red diluted

    The color test is the best way to know for sure. In some cases, a dogs genotype is known because the parents were tested and can only pass down the genes they have.

    Recessive genes can remain hidden for generations so the color test is the way to know for sure.
     
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