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    Gernald's Avatar
    Gernald Posts: 901, Reputation: 93
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    #1

    Feb 3, 2009, 03:33 PM
    Ratios of a dihybrid cross
    Don't know if this is the right spot for this, but whatever.
    I have a dihybrid cross with 1,000 offspring of these 1,000:
    253 are Red and Spotted
    263 are Red and Clear
    253 are White and Spotted
    231 are White and Clear

    I want to organize these in to a phenotypic ratio like this (a ratio in this case being numbers to 1, so in this case white and spotted would be 1):
    (red and clear: red and spotted: white and clear: white and spotted)

    How do I make this in to a ratio? I know how to find the ratio of a regular dihybrid cross, but don't understand how to make it to one with this larger scale.
    tickle's Avatar
    tickle Posts: 23,796, Reputation: 2674
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    #2

    Feb 3, 2009, 04:15 PM

    Okay, hi gernald, what is a 'dehybrid cross'. I don't want to get in trouble like I did two years ago, when the OP meant his aquarium fish and I thought he meant a dog :)
    Gernald's Avatar
    Gernald Posts: 901, Reputation: 93
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    #3

    Feb 3, 2009, 04:24 PM
    Quote Originally Posted by tickle View Post
    okay, hi gernald, what is a 'dehybrid cross'. I dont want to get in trouble like I did two years ago, when the OP meant his aquarium fish and I thought he meant a dog :)
    A dihybrid cross is a cross between two different parents with two different traits like hair color and eye color that shows the resulting possible genotypes (a genotype to try to put it simply shows what the organisms traits are) of the offspring.

    Hope that helps... lol fish vs dog, I imagine that was awkward.
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    tickle Posts: 23,796, Reputation: 2674
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    #4

    Feb 3, 2009, 05:32 PM

    Okay, very interesting question, gernald, inheritance patterns...
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    Gernald Posts: 901, Reputation: 93
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    #5

    Feb 3, 2009, 08:31 PM

    It's not so much about the inheritance patterns as it is how to do ratios... which I can't seem to get.

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