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    Breeding Dihybrid Crosses

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    In cocker spaniels, black coat color (B) is dominant over red (b), and solid color (S) is dominant over spotted (s). If two dihybrids (Bb Ss) were crossed, which would be produced?

    A. black and spotted pure-breeding forms
    B. black and solid pure-breeding forms
    C. red and solid pure-breeding forms
    D. red and spotted pure-breeding forms
    E. all of these

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    Solution Preview

    A dihybrid cross will produce two homozygotes (one dominant and one recessive) and two heterozygotes. Try doing a Punnet square on a regular Aa x Aa cross and you will get this ratio. This will be an 8-celled Punnet ...

    Solution Summary

    This question and answer describes how to do a dihybrid cross. In the solution the steps needed to get the right answer for doing a dihybrid cross are outlined.