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B250WT3S05 - M.CO 411 MED PR E 1.C OM BIL 250/P Exam 3 PR...

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BIL 250/P Exam 3 (4/19/05) Student Name: Student ID#: 1. The cross GE/ge X ge/ge produces the following progeny, GE/ge 404; ge/ge 396; gE/ge 97; Ge/ge 103. From these data, how many map units one can conclude between the G and E loci. A. 10 B. 40 C. 80 D. 20 E. 30 Answer: D 2. While the most frequent forms of Down syndrome are caused by a random error, nondisjunction of chromosome #21, Down syndrome occasionally runs in families. The cause of this form of familial Down syndrome is _____________. 3. A genomic condition which may be responsible for some forms of fragile-X syndrome as well as Huntington disease involves A. F plasmids inserted into the FMR -1 gene. B. various lengths of trinucleotide repeats. C. multiple breakpoints fairly evenly dispersed along the X chromosome. D. multiple inversions in the X chromosome. E. single translocations in the X chromosome. Answer: B 4. Assume a species has a diploid chromosome number of 24. The term applied to an individual with 25 chromosomes would be triploid. 5. Direction of shell coiling in the snail, Limnaea peregra , is conditioned by a form of inheritance known as 6. One explanation for organelle inheritance is that PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.COM - PREMED411.CO M
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A. mitochondria and chloroplasts lack DNA and are therefore dependent on the maternal cytoplasmic contributions. B. mitochondria and chloroplasts have DNA which is subject to mutation. C. organelles such as mitochondria are always "wild type." D. chloroplasts, for example, are completely dependent on the nuclear genome for components. E. none of the above. Answer: B 7. Mitochondrial mutations are passed equally to offspring by both males and females. A. True B. False Answer: B
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