Help with simple probability question!! Excellent question.

Discussion in 'Probability' started by Duke Morrison, Sep 20, 2004.

  1. Q: In a certain species of rats, black dominates over brown. Suppose
    a black rat with two black parents has a brown sibling.
    (a) What is the probability that this rat is a pure black rat
    (as opposed to being a hybrid with one black and one
    brown gene)?
    (b) Suppose that when the black rat is mated with a brown
    rat, all five of their offspring are black. Now, what is the
    probability that the rat is a pure black rat?

    An answer to this question would be greatly appreciated... I have a
    hunch that the answers are 1/3 and .94 but cannot fully confirm
    this... they could be wrong. If anyone has a descriptive solution of
    any sort i'd be very grateful. Thank you!
    Duke Morrison, Sep 20, 2004
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  2. Please do not bother with answering this question as I have now
    confirmed my answer properly. But thanks to all those who took the
    time to read it anyways. =]
    The answer is indeed 1/3 and .94 for all those interested.
    Duke Morrison, Sep 21, 2004
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