Biology 313 – Exam I - ANSWERS
February 6, 2008
For this exam, use the ORANGE score sheet
Fill in your student ID on the ORANGE score sheet
Choose ONE alternative to BEST complete the statement or answer the question.
1.
What types of phenotypic ratios are most likely to occur in crosses when dealing with
a single gene pair?
a. 3:1, 1:1, 1:2:1
b. 1:1:1:1, 1:4:6:4:1
c. 9:7, 12:3:1
d. 9:3:3:1, 1:2:1
e. 15:1, 1:2
2.
A white-eyed
Drosophila
female is crossed with a red-eyed
Drosophila
male. There
are 60 progeny, of which 40 are white-eyed males and 20 are red-eyed females.
You
use chi-square analysis to test if these results differ from what is expected. Which of the
following statements is true:
a. chi-squared = 6.7, p-value = approx 1%, the data do not differ from
expectations
b. chi-squared = 6.7, p-value = approx 4%, the data differ from expectations
c. chi-squared = 2.2, p-value = approx 35%, the data do not differ from
expectations
d. chi-squared = 6.7, p-value = approx 1%, the data differ from expectations
e. chi-squared = 2.2, p-value = approx 15%, the data do not differ from
expectations
3.
The phenomenon in which more double crossovers occur than are expected for a
region is called
a. chiasma.
b. negative interference.
c. positive interference.
d. synaptonemal complexity.
e. reciprocal genetic exchange.
4.
Ability to roll the tongue is caused by a dominant allele.
A woman is a “roller,” but
We forgot to include a chi-square table for you to consult!!!! Therefore, everyone received
credit for this question. If you left it blank or marked the correct answer or marked an
incorrect answer, no matter what, you received credit.