lecture7&8 - 8/17/08 Clicker Question 71 In a plant...

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Unformatted text preview: 8/17/08 Clicker Question 71 In a plant species, if the B allele (blue flowers) and the b allele (white flowers) are incompletely dominant (Bb is light blue), what offspring ratio is expected in a cross between a blueflowered plant and a whiteflowered plant? A. blue: light blue: white B. blue: white C. All light blue D. blue: white E. 1/3 blue:1/3 light blue:1/3 white Clicker Question 72 If a mother has type A blood and her son has type O blood, what are the possible blood types of her son's father? A. type O only B. types A or O C. types B or O D. types A, B, or O E. any blood type 1 8/17/08 Clicker Question 73 A cross between two shorttailed mice results in offspring in the ratio of 2/3 shorttailed and 1/3 longtailed. The best explanation for this result is that A. two alleles are codominant. B. there is a recessive lethal allele. C. there are at least three alleles. D. there is simple dominance between two alleles. E. there is a dominant lethal allele. Clicker Question 74 Yeast mitochondria have a tubular morphology. In a mutagenic screen, two mutants are isolated that have fragmented mitochondria instead of tubular mitochondria. To determine if these two mutations are at the same or different loci, the two mutants are crossed. The progeny all have tubular mitochondria. What do you conclude? A.The mutations are at different loci. B.The mutations are at the same locus. C.Not enough data is presented. 2 8/17/08 An XLinked Recessive Trait A YLinked Trait 3 8/17/08 Clicker Question 75 Duchenne muscular dystrophy is caused by a recessive Xlinked allele. A man with this disorder A. could have inherited it from either parent. B. must have inherited it from his mother. C. must have inherited it from both parents. D. can pass it along to all of his children. E. can pass it along to only his sons. Clicker Question 76 If a colorblind female has children, what do we know about her sons? A. Half of the sons will be colorblind. B. All sons will be color blind. C. All sons will have normal color vision. D. She would not be able to have a son. E. It is impossible to know without knowing the father's genotype. 4 ...
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This note was uploaded on 09/12/2008 for the course BICD 100 taught by Professor Nehring during the Summer '08 term at UCSD.

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