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  1. #1
    BPnet Veteran jhall1468's Avatar
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    Genetics... a quick explanation

    This is pretty basic stuff, but I needed to give a quick explanation to a friend that was confused (why Spiders are dominant and Pastels aren't) so I figured I'd post my explanation.

    A side note:
    * Genes come in "pairs", called alleles, they get one from both parent. When we talk about "hets" we are speaking of animals where one gene is "normal" and the other is mutated. Whereas, in homozygous animals, both genes are mutated.

    * So it logically follows that breeding a homozygous ball python to any other ball python will produce 100% heterozygous offspring for that animal.

    Simple Recessive

    Heterozygous - The animal carries the gene, but has no visible mutation (it appears normal). Example: het Albino, het Piebald.

    Homozygous - The animal carries the gene, and appears as a visible mutation. Example: Albino, Piebald.

    Recessive traits require that both genes be mutated for the mutation to be visible. This is where the term "het" is typically used.

    Codominant

    Heterozygous - The animal carries the gene, and appears as a visible mutation. Example: Pastel, Woma.

    Homozygous - The animal carries the gene, and appears as a visible mutation that is distinctly different from its heterozygous form. Example: Super Pastel, Super Woma.

    It is important to note, the "Super" versions of codominant genes are not true dominant genes, which will be explained below.

    Dominant

    Heterozygous - The animal carries the gene, and appears as a visible mutation. Example: Spider.

    Homozygous - The animal carries the gene, and appears as a visible mutation with no visible differences in comparison to its heterozygous form. Example: Spider.

    True dominant genes will always appear the same, whether it's heterozygous or homozygous.

    Pastels have brighter colors and blushing, Super Pastels have the same, just more of it. The reason why is simple: Pastels exhibit both the "Pastel" gene and the "Non-Pastel" gene, which diludes the mutation. So a "Pastel" could also be called a "het Super Pastel".

    If I made a mistake anyone, please let me know .
    Last edited by jhall1468; 10-11-2006 at 07:42 PM.
    Justin Hall

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