exam4 summer 2010 key - GENE 3200 Summer 2010 Bedell Exam 4...

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GENE 3200 – Summer 2010 – Bedell Exam 4 – July 26 – vA (no asterisk) ID no. 810__________ KEY ________________ 1 Write your ID number (810 number, NOT SSN) on every page. Write your initials on the first page only. All of the multiple choice questions have only one correct answer. The exam should be completed in ink. Regrades will not be given if you write in pencil. All requests to re-grade an exam must be made in writing to Dr. Bedell within 48 hours of the grades being posted on WebCT. 1. (3 pts) In a translocation heterozygote, which segregation pattern results from disjunction? A. Alternate B. Adjacent-1 C. Adjacent-2 D. A and B E. B and C F. A and C G. A, B, and C H. Neither A, nor B, nor C 2. (3 pts) A chromosomal abnormality in which the centromeric regions of two non-homologous acrocentric chromosomes become fused to form a singular centromere is known as a(n) ___________. A. reciprocal translocation. B. nonreciprocal transversion. C. Robertsonian translocation . D. Philadelphia translocation . E. inversion. 3. (3 pts) Which is NOT a possible consequence of a transposable element (TE)? A. Inactivation of a gene through insertion of a TE into a coding region of a gene. B. Altered expression of a gene through insertion of a TE into a regulatory sequence. C. Reversion of a mutant phenotype by precise excision of a TE. D. A chromosomal rearrangement through unequal crossing-over between two TEs. E. Generation of a nonconservative substitution. 4. (1 pt). True or false. During transposition of a retroposon, the original copy of the retroposon is retained and a new copy inserts in another location. 5. (1 pt) True or false. Barbara McClintock discovered the chromosomal translocation that causes chronic myelogenous leukemia in humans. 6. (3 pts) Triploid organisms usually result from which of the following? A. The union of haploid and diploid gametes. B. Unequal disjunction during embryogenesis. C. An extra round of mitosis in gametes. D. Fusion of three gametes simultaneously. E. None of the above. 7. (1 pt). True or false. Nondisjunction can occur in either meiosis or in mitosis. 8. (2 pts) The red fox species has 17 pairs of large chromosomes and the arctic fox species has 26 pairs of smaller chromosomes. If a new species formed from the hybridization of these two species, what do you expect to be the chromosome number in somatic cells (not the germ cells) of the hybrid? Answer: 2(17 + 26) = 86 9. (1 pt) True or false . The new hybrid species derived from a red fox and an arctic fox (see previous question) would be an autopolyploid. 10. (1 pt) True or false. Polyploids with an even number of chromosomes are more likely to be fertile than those with an odd number .
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GENE 3200 – Summer 2010 – Bedell Exam 4 – July 26 – vA (no asterisk) ID no. 810__________ KEY ________________ 2 11. (3 pts) In a certain species of tree, individual trees have been identified that have somatic chromosome numbers of 28, 56, 70, and 84. Which of these trees are pentaploid (penta = 5)?
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This note was uploaded on 10/05/2011 for the course GENE 3200 taught by Professor Condie during the Summer '08 term at University of Georgia Athens.

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exam4 summer 2010 key - GENE 3200 Summer 2010 Bedell Exam 4...

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