B250WT2S04 - Exam 2 BIL 250/GU Genetics 10/19/04 Form 1 *:...

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Exam 2 BIL 250/GU “Genetics” 10/19/04 Form 1 *: The highlighted choice is the correct answer. 1. Which of the following is NOT true about homologous chromosomes? a). Homologous chromosomes are identical in length. b). Homologous chromosomes share the same centromere locations. c). One of each pair of homologous chromosomes is produced from the other in S phase. d). Homologous chromosomes carry the same sequence of gene sites (loci). e). One chromosome is of maternal origin while the other is of paternal origin. 2. Which of the following is NOT a difference between mitosis and meiosis? a). Mitosis begins with a 2n cell while meiosis begins with a 1n cell . b). Mitosis produces two cells while meiosis produces 4 cells. c). Mitosis produces genetically identical cells whereas meiosis produces genetically different cells. d). Mitosis produces either haploid or diploid cells (depending on the original cell) whereas meiosis always produces haploid cells. e). Mitosis occurs in somatic cells while meiosis occurs in germ line cells. 3. If the p53 gene in a cell is mutated, which of the following situations may occur? a). Cells with damaged DNA may proliferate in an uncontrolled manner b). The G0 checkpoint won't work properly c). Cells cannot pass the M checkpoint, no matter what d). Cells cannot pass the G1/S checkpoint e). Cells are marked for apoptosis 4. During metaphase II for an organism with a diploid number of 4, how many chromatids are aligned in the equatorial plane of a cell? a). 2 b). 4 c). 6 d). 8 e). 10 5. In a healthy female, how many secondary oocytes would be expected to form from 100 primary oocytes? How many first polar bodies? a) 200, 50
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c) 200, 300 d) 100, 100 e) 50, 50 6. Assume that in a series of experiments, plants with round seeds were crossed to plants with wrinkled seeds and the following offspring were obtained: 220 round; 180 wrinkled. What genotypic ratio is expected? Based on the information provided above, what are the expected (theoretical) numbers of progeny of each phenotypic class? a) 3:1 ; 300 and 100 b) 1:1; 200 and 200 c) 1:2:1; 100, 200, and 100 d) None of the above. 7) Dentinogenesis imperfecta is a rare, autosomal, dominantly inherited disease of the teeth which occurs about one in 8000 (Witkop, 1957). The teeth are somewhat brown in color and the crowns wear down rapidly. Assume that a male with dentinogenesis imperfecta and no family history of the disease, marries a woman with normal teeth. What is the probability that their first child will be a girl with dentinogenesis imperfecta ? a) ½ b) 1/8 c) ¼ d) 1/16 e) 0 8) Hemizygosity would most likely be associated with which of the following? a) codominance b) incomplete dominance c) trihybrid crosses d) sex-linked inheritance e) sex-limited inheritance 9) Assume that a dihybrid F2 ratio, resulting from epistasis, was 9:3:4. If a double heterozygote was crossed to the fully recessive type, what phenotypic ratio is expected among the offspring? a) 1:1:2
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This document was uploaded on 10/27/2011 for the course BIL 250 at University of Miami.

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B250WT2S04 - Exam 2 BIL 250/GU Genetics 10/19/04 Form 1 *:...

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