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quiz1 key - parents will be a blue-eyed taster? AaBb x AaBb...

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1 AGRY 320 GENETICS Spring 2011 January 24, 2011 QUIZ #1 NAME ______________________________________________ Carefully read the material and the instructions and answer the questions. Feel free to use the back of this page to perform Punnett squares and other work so that you can clearly place your answers under the questions. To receive full credit, your answers must be circled.
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2 In humans, the allele for ability to taste PTC (phenyl-thio-carbamide), A , is dominant to the allele for inability, a , and the allele for brown eyes, B , is dominant to the allele for blue eyes, b . (A) What is the probability that the first child of two AaBb
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Unformatted text preview: parents will be a blue-eyed taster? AaBb x AaBb -> 1AABB, 2AABb, 1AAbb, 2AaBB, 4AaBb, 2Aabb, 1aaBB, 2aaBb, 1aabb 3/16 (B) What is the probability that the first child of two AaBb parents will be a blue-eyed non-taster? AaBb x AaBb -> 1AABB, 2AABb, 1AAbb, 2AaBB, 4AaBb, 2Aabb, 1aaBB, 2aaBb, 1aabb 1/16 (D) What proportion of the children of two parents of genotypes AaBB and aabb would be expected to be brown-eyed tasters? AaBB x aabb -> 1AaBb, 1aaBb 1/2 (F) A man with blue eyes marries a brown-eyed woman whose mother had blue eyes. What proportion of the children would be expected to have blue eyes? bb x Bb -> 1Bb, 1bb 1/2...
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quiz1 key - parents will be a blue-eyed taster? AaBb x AaBb...

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