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Math Help - Chi square Dominant phenotype problem

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    Chi square Dominant phenotype problem

    What is the ChiSquare value for the dominant phentotype of the cross Purple versus White. Should the answers be 696.75 or 696?? Neither are correcct



    Parental Phenotypes

    Purple X White


    F1 Phenotype


    All Purple


    F2 Phenotype

    705 purple, 224 white


    I must be missing something:

    Observed Purple=705

    Observed White= 224

    Total 929

    Expected for Purple 705/929=.75

    .75x929= 696.75 Purple Expected

    Expected White 224/929=.24

    .24 x 929= 222.96 White Expected


    Second part of the question is

    What is the Chi Square Sum (rounding to 3 significant figures) for Purple versus White cross. 0.391 How did they get 0.391?

    But when I try to get this answer I use the formula (O-E)^2/E and get .09768 for Purple and .0048 for White which equals .1085


    Third part of the question:

    Using the following web site: (http://www.graphpad.com/quickcalcs/PValue1.cfm)
    What is the P-value (rounding to 3 significant figures) for Purple versus White cross.
    Last edited by sonyab523; February 26th 2010 at 12:34 PM.
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