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Genetics question -

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  • 09-12-2007, 03:13 PM
    Morphie
    Genetics question -
    Has anyone sequenced the various BP morphs? So far I haven't been able to figure if the Mojave, for example, is a morph that is co-dominant or incomplete dominant. Apparently it is difficult to determine without sequencing. Has anyone done it? Does anyone have arguments as to why it would be co-D as opposed to incomplete-D?

    Of course this question applies to all alleged "co-dominant" morphs, such as spider, cinnie, etc.
  • 09-12-2007, 03:17 PM
    Freakie_frog
    Re: Genetics question -
    Quote:

    Originally Posted by Morphie
    Has anyone sequenced the various BP morphs? So far I haven't been able to figure if the Mojave, for example, is a morph that is co-dominant or incomplete dominant. Apparently it is difficult to determine without sequencing. Has anyone done it? Does anyone have arguments as to why it would be co-D as opposed to incomplete-D?

    Of course this question applies to all alleged "co-dominant" morphs, such as spider, cinnie, etc.


    That would be a huge task that really would matter in the long run. But to answer your question no.

    PSSSST spiders aren't co/dom ;)
  • 09-12-2007, 04:14 PM
    Morphie
    Re: Genetics question -
    Quote:

    Originally Posted by Freakie_frog
    That would be a huge task that really would matter in the long run. But to answer your question no.

    PSSSST spiders aren't co/dom ;)

    ack! i knew that! lol. thanks.
  • 09-12-2007, 06:05 PM
    littleindiangirl
    Re: Genetics question -
    Have they proven that they are dominant? Or is the dominant version a fatal? Has someone bred a spider to a spider and then bred that gen to each other to prove that there is no co-dom gene? I'm sure they have, just wanna know what they got and what bad effects there were from it.
  • 09-12-2007, 06:14 PM
    CntrlF8
    Re: Genetics question -
    so far, nobody has been able to prove out a "super spider" which generally indicates that it's a dominant gene.
  • 09-12-2007, 06:48 PM
    littleindiangirl
    Re: Genetics question -
    I'm just asking because maybe its a fatal gene when its homozygous. If it were truly dominant, then bred to a normal would create all spiders. So calling it dominant is misleading. It needs a category of its own i think.
  • 09-12-2007, 07:43 PM
    Seneschal
    Re: Genetics question -
    No, if it were dominant and the parent carrier was heterozygous spider (visible spider) bred to a normal then the spider parent would only contribute one allele, not necessarily the one necessary for a spider morph.

    ---S---N
    N| SN NN
    N| SN NN

    so, 50% spider, %50 normal.

    ---S---N
    S| SS SN
    N| SN NN
    50% heterozygous (but still visible spider), 25% normal, and 25% homozygous spider--theoretically identical to the het spiders, so you wouldn't be able to tell unless you bred it to a normal.

    ---S---S
    N| SN SN
    N| SN SN

    so the homo spider bred to a normal would make all spiders, thus theoretically proving the spider a dominant gene and proving that particular spider parent to be homozygous for the trait.
  • 09-13-2007, 07:03 AM
    littleindiangirl
    Re: Genetics question -
    Right, your 50/50 is still what most would call the co-dom morph because the het version expresses that gene, just like pastel and many others. I'm more interested in what actually comes from a spider/spider crossing for 2 consecutive generations. If there is actually a homozygous form.
  • 09-13-2007, 09:30 AM
    Seneschal
    Re: Genetics question -
    As a dominant gene the homozygous form of the animal would be identical to the heterozygous form.
  • 09-13-2007, 10:05 AM
    Seneschal
    Re: Genetics question -
    Here's a visual representation (the pics aren't mine but there you have it.)

    DOMINANT GENES: Spider used as example.

    http://img.photobucket.com/albums/v4...spidergene.jpg


    CODOMINANT GENES: Pastel used as example.

    http://img.photobucket.com/albums/v4...nantpastel.jpg
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