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Unformatted text preview: 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 ? A) Yes, always B) It may or it may not C) No, never 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 As paired with Ts the other strand consists of Gs paired with Cs. I V . 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. A) only I B) only III C) only V D) II and IV E) III and V 4. In humans, males receive their X-Chromosome from _________________________________________ A) their mother and transmit it only to their daughters. B) their father and transmit it only to their daughters. C) either their father or their mother. D) their mother and transmit it only to their sons. E) none of the above 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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This note was uploaded on 10/03/2011 for the course CHEM 31 taught by Professor Roberts during the Fall '10 term at Lehigh University .
- Fall '10