Unit II PRACTICE Exam-B

Unit II PRACTICE Exam-B - UNIT II PRACTICE Exam-B BSC 2011...

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UNIT II PRACTICE Exam-B BSC 2011 SPRING 2008 PLEASE READ EACH QUESTION SLOWLY AND CAREFULLY. DO NOT LOOK AT THE CHOICES UNTIL YOU HAVE THOUGHT ABOUT THE QUESTION. ANSWERS ARE POSTED AT THE END 1. You have a red die and a green die. What is the probability of rolling a combined total of “three” on one roll of these dice? A. 1/4 B. 1/12 C. 1/16 D. 1/18 E. 1/36 Please use the information below to answer problems 2 and 3. In peas, the P allele for red flower color is incompletely dominant over the p allele for white flower color. A true breeding red-flowered plant and a true-breeding white-flowered plant are crossed. 2. The F 1 offspring of the above cross have the following phenotypic ratio: 3. Two of the F1 plants resulting from the above cross are grown and then crossed with each other. How many different phenotypes are possible in the F2 offspring? 4. For the coat-color gene, the brown fur allele (B) is completely dominant to the white fur allele (b). When crossing a homozygous recessive with a heterozygote for this characteristic, what is the chance of getting an offspring that displays the dominant phenotype ? A. 50% B. 75% C. 100% D. 0% E. 25% Please use the information below to answer questions 5 and 6. The genotype of a cow is BbSSHh, where the alleles for black fur (B), shaggy coat (S), and horns (H) are completely dominant over alleles for white fur (b), straight coat (s), and hornless (h). 5. Which of the following represents the genotype of a possible gamete (sex cell) from this cow? 6. If this cow (BbSSHh) mates with a bull that has the genotype bbssHh, what proportion of offspring will be white, shaggy, and hornless? A. 1/16 B. 1/8 C. 1 D. 3/4 E. 9/16 7. A couple has three children, all of whom have brown eyes and blond hair (for this problem, assume that eye color and hair color are each controlled by a single gene). Both parents are homozygous for brown eyes (BB), but one parent is blond (rr) and the other is redhead (Rr). What is the probability that their next child will be a brown-eyed redhead?
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Please use the information below to answer questions 8 and 9. In Labrador retrievers, coat color is controlled by one gene, such that the black fur allele (B) is dominant over the brown allele (b). The actual deposition of coat color, however, is controlled by a second gene, such that homozygous recessive dogs with the cc genotype have a golden coat regardless of their genotype for the coat-color gene.
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