Practice+exam+3 - Biology 171 Student Name Fall 2010...

Biology 171 Student Name ______________________________
Fall 2010 Signature _________________________________
Third Exam Student ID ________________________________
GSI/Section _______________________________
PLEASE READ THESE IMPORTANT INSTRUCTIONS:
Practice Exam 3
1. Please provide the information requested at the top of this page, then initial the
remaining pages of the exam . As you do so, please verify that your booklet has 19
total pages.
2. On the left side of the Scantron answer sheet, bubble in your NAME, three-digit
LAB SECTION NUMBER, and eight digit STUDENT ID NUMBER. Enter the
number shown above in the FORM column. On the right side of the Scantron, write
your signature, the course number, and the date. Under the heading "Other", enter
your GSI's NAME.
3. Answer all 30 multiple-choice questions in SECTION A. In each case, choose the
one best, most complete answer. The multiple-choice questions are worth 2 points
each. Use a No. 2 pencil to mark your answers on the Scantron answer sheet. Do not
make marks on the answer sheet outside of the designated areas. Do not fold the
answer sheet.
4. Answer 4 of the 5 short answer questions in SECTION B and cross out the
surplus question . These are worth 10 points each. If all 5 short answer questions are
answered, the first 4 ONLY will be assessed. The exam has 100 total points.
5. Only multiple choice answers entered on the ANSWER SHEET will be graded.
Questions with more than one answer marked will be scored as incorrect. There is no
penalty for guessing. In the rare instances where you feel a question is ambiguous,
you may write an explanatory sentence in the margin of the exam (not on the answer
sheet) next to the question to justify the answer you select. You may change an
answer on the answer sheet by completely erasing the incorrect answer. Do not cross
out an incorrect answer; the scoring machine will count it as marked.
6. At the end of the exam, turn in BOTH the ANSWER SHEET and ALL PAGES OF
THE EXAM BOOKLET to YOUR GSI.
7. Good Luck!

SECTION A: MULTIPLE CHOICE QUESTIONS (answer all 30)
1. Cystic fibrosis is a genetic disorder caused by a recessive, autosomal allele that
causes death during the teen years. In a particular population, 9 in 10,000 babies
are born with the disease. According to the Hardy-Weinberg model, what are the
expected frequencies (f) of the dominant ( C
1
) and recessive ( C
2
) alleles in this
population?
a) f( C
1
) = 0.9997, f( C
2
) = 0.0003
b) f( C
1
) = 0.9800, f( C
2
) = 0.0200
c) f( C
1
) = 0.9700, f( C
2
) = 0.0300
d) f( C
1
) = 0.9604, f( C
2
) = 0.0392
e) f( C
1
) = 0.9600, f( C
2
) = 0.0400