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Exam_4A - BioS 115 Genetics Exam 4A 9:00-11:00am Name I M P...

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BioS 115 Exam 4A _______________________ Genetics December 15, 2010; 9:00-11:00am Name Page 1 of 7 IMPORTANT: Fir st , wri t e t h e e xam v e r s ion (A , B , or C) on t h e an s w e r c ard! Th e r e ar e 50 qu e st ion s on t h e e xam , wor t h a t o t al of 100 poin ts . Pl e a s e r e ad t h e qu e st ion s c ar e fully . Alway s c hoo s e t h e MOST CORRECT an s w e r . Mark an s w e r s on t h e e xam s h ee t F IRST . Wh e n you ar e c onfid e n t t ha t your an s w e r s ar e c orr ec t , mark t h e s c an t ron s h ee t u s ing a No . 2 p e n c il . Thi s st ra t e gy avoid s e ra s ur e s on t h e s c an t ron s h ee t . Bo t h t h e e xam and s c an t ron s h ee ts will b e c oll ec t e d . Th e following s ymbol s ar e u s e d for p e digr ee s s hown: = mal e wildtyp e ph e notyp e ; O = f e mal e wildtyp e ph e notyp e ; = mal e mutant ph e notyp e = f e mal e mutant ph e notyp e ; 1. Essential components for a PCR reaction are all of the following, except: A) dNTPs B) DNA polymerase C) primers D) dideoxynucleotides E) at least one copy of the DNA sequence to be amplified 2. If gene a is linked to gene b , and b to gene c , and c to gene d , does it follow that a recombination experiment would detect linkage between a and d ? 3. The two strands of a duplex DNA molecule are said to be complementary in base sequence. Which of the following statements are implied by the complementary nature of the strands? I . The two strands have the same sequence of bases. II . The base A in one strand is paired with a T in the other strand. III . One strand consists of A’s paired with T’s; the other strand consists of G’s paired with C’s. IV . The base G in one strand is paired with a C in the other strand. V . The two strands have the same sequence of bases when read in opposite directions. 4. In humans, males receive their X-Chromosome from _________________________________________ 5. Is it necessary for a gene that encodes a repressor protein to be located near the gene whose promoter it regulates? A) Yes, it has to be directly upstream (5’) of the promoter. B) Yes, it has to be directly downstream (3’) of the promoter. C) No, it can be located anywhere in the genome. D) It has to be located on the same chromosome, but is not required to reside in close proximity. E) None of the above statements is correct.
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